Broke into Liam Spencer's e-mail to forward a tribute video made for his ex-wife, Steffy Forrester, to his fiancee, Hope Logan 
Jabbed her ex, Bill Spencer, with his sword necklace and licked his blood 
Trapped Liam Spencer in a freight elevator 
Held Aly Forrester over a second-story railing 
Trapped Liam Spencer in a steam room and turned up the heat 
Stole the keys to the Forrester cabin in Big Bear so her son Wyatt could be with Hope Logan 
Stabbed Liam Spencer in the throat with his sword necklace 
Tried to kill Liam Spencer with a sword 
Stole a motorcycle in Paris 
Pushed Ivy Forrester into Paris' River Seine 
Stole a pair of binoculars from a Parisian tourist 
Held a gun on Deacon Sharpe 
Broke into the Forrester compound to lurk at Hope Logan's baby shower 
Slapped Brooke Logan so hard she fell to the ground 
Quinn Fuller was a jewelry designer who ran her own company, Quinn Artisan Jewelers, along with her son, Wyatt Fuller. Quinn worried when Hope Logan, a girl Wyatt was interested in, noticed that Liam Spencer, her on-again-off-again boyfriend/fiancé/husband, wore a sword necklace just like Wyatt's, as did Liam's father, Bill Spencer, Jr. Quinn balked at Hope's theory that Bill could be Wyatt's father, insisting that she'd only ever made one sword necklace, which she'd kept in a safe until Wyatt wanted to wear it. Hope and Wyatt tricked Quinn into running into Bill, and Quinn was forced to admit to a long-ago affair, during which Bill had given Quinn money for an abortion. Wyatt was furious that Quinn had lied about his father being dead.
Quinn was stunned when Wyatt claimed Bill's company, Spencer Publications, as his birthright, and declared he was also going after Hope. After Wyatt ran afoul of Bill, Quinn and Wyatt reconciled, and Quinn was thrilled that Hope wanted Quinn to design jewelry for her high-profile fashion collection at design house Forrester Creations. Quinn was charmed by Forrester's CEO, Eric Forrester, then overheard Hope arguing with Liam, who wanted Hope to kill the deal because he didn't want her working so closely with the amorous Wyatt. Quinn made a beeline for Eric's house and was wowed by the luxurious surroundings; stealthy Quinn listened as Eric told Hope the deal would be honored and surprised Eric with a thank-you kiss.
With Hope and Liam's wedding approaching, Quinn sent Wyatt and Hope to Mexico to retrieve a special diamond for Hope's clothing line, Hope for the Future. Learning that Liam had made a tribute video as a way of saying goodbye to his ex-wife, Steffy Forrester, Quinn broke into his e-mail and forwarded it to Hope, which ended Hope's engagement to Liam and pushed her closer to Wyatt. Liam discovered Quinn's treachery and Wyatt's after-the-fact complicity, but the damage had been done. Quinn heard Bill telling Wyatt to back off of Hope out of respect for Liam, so she stuck Bill with his sword necklace, licking the blood and saying revenge tasted sweet. Quinn was ecstatic when Eric invited her to the big Forrester Thanksgiving dinner and told her to consider herself part of the family. Quinn spied Eric's ex-wife, Donna Logan, giving Eric a kiss, so she confronted Donna and called her a slut.
Knowing that Steffy continued to be a source of conflict between Liam and Hope, Quinn took advantage when Steffy visited from Paris, hopping a plane back to Europe with her. Quinn got Steffy to admit that she had abandoned Liam because an accident had left her barren; when a doctor called to tell Steffy that the procedure she had secretly undergone made it possible for her to have children, Quinn pushed Steffy to tell Liam, who was set to marry Hope. Steffy's presence on Liam and Hope's wedding day stopped their ceremony, and Hope moved on to Wyatt, just as Quinn planned.
Quinn sprang into action when security footage surfaced of Wyatt pocketing the HFTF diamond and planting it on arriving jewel thieves. Since the Forresters, and the world, believed that Wyatt was a hero for stopping the thieves, Quinn threatened the diamond's guard, Charlie, into keeping his mouth shut; Quinn also befriended Charlie's girlfriend, Pam Douglas, in an effort to muzzle him. But Pam caught on and showed the footage to Liam, who wanted to prove that Wyatt and Quinn were not who they claimed to be. Quinn trapped Liam in a freight elevator to keep him from exposing Wyatt, which Liam did as soon as he escaped.
Quinn was relieved when Hope forgave Wyatt and kept his "theft" to herself, but Quinn still wanted Liam gone; she noticed that young Aly Forrester had a crush on him, so Quinn gave Aly a makeover and sicced her on Liam. But Aly, who had mental issues from traumatically losing her mother at a young age, became a problem for Quinn when she directed her rage at Wyatt: Aly discovered that Wyatt had "stolen" the HFTF diamond to make himself look good to Hope and wanted to go to the police. Quinn grabbed the girl and held her over a second-story railing to terrorize her into keeping quiet. Although Aly fought back and ran straight to Eric, Quinn scored another victory when the Forresters decided to bury Wyatt's involvement with the diamond theft to prevent a media scandal.
Quinn found she was still intrigued by Bill, who had just been dumped by Hope's mother, Brooke Logan. Quinn and Bill's bickering soon progressed into a night of raucous S&M sex. Bill swore it wouldn't happen again, but Quinn snuck into Bill's bedroom, and their rough passion exploded once more. When Brooke came over wanting to talk, Bill stashed Quinn in his closet. Quinn had taken a selfie of herself next to a naked, sleeping Bill, and later used it to manipulate Bill into officially making Wyatt a Spencer. Then, Quinn trapped Liam in the Forrester steam room and cranked up the heat in an attempt to keep him away from Hope, who had decided to date both Wyatt and Liam. But when Quinn decided she wanted Bill for herself, she showed Brooke's ex-husband, Ridge Forrester, the naughty photo of her and Bill, knowing Ridge would fly to Abu Dhabi to stop Bill and Brooke's Middle Eastern wedding.
When Ridge went missing after falling out of a helicopter and into the Persian Gulf, Quinn found herself blamed by everyone at Forrester Creations. Wyatt punched Liam for calling Quinn a "vile, manipulative, evil bitch," but the violent act convinced Hope to choose Liam over Wyatt, even after Quinn stole the keys to the Forrester cabin in Big Bear so Wyatt could propose to Hope. Forrester terminated its contract with Quinn Artisan Jewelers, and Wyatt wanted nothing more to do with Quinn. Drowning her sorrows at a bar, Quinn met Deacon Sharpe, the man who just happened to be Hope's estranged father. Quinn offered Deacon a place to stay if he would help push Hope back toward Wyatt.
Holding Liam responsible for all her problems, Quinn stabbed Liam in the throat with his sword necklace during an argument, then told Deacon she wanted to kill Liam. Deacon thought Quinn was joking, but Quinn went to work welding a mysterious contraption in her warehouse. On a windy night, Liam was startled when he investigated banging noises around his house and saw Quinn's face outside his patio door. Quinn told Liam she would kill him and Hope if he didn't stay away from her, then showed Deacon a full-size version of the Spencer sword necklace she had made. Quinn returned to Liam's house under the cover of noisy Fourth of July fireworks and was ready to impale him with the sword when Wyatt walked in and stopped her. Neither Wyatt nor Liam wanted to call the cops, so Quinn ran away.
Before long, Quinn sent Wyatt a text, reporting that she had checked herself into a psychiatric hospital. A few weeks later, Quinn came home to a dispassionate Wyatt, who had inherited the HFTF diamond from its owner, Ricardo Montemayor. Quinn encouraged Wyatt to give the diamond to Hope to win her back from Liam. When Quinn learned that Liam was set to meet Hope in Paris to get married, she followed Liam overseas and pushed his new friend, Ivy Forrester, into the River Seine, knowing he'd jump in to rescue her. Quinn watched via stolen binoculars as the delay caused Liam to be late, and as Hope got fed up and left with Wyatt. Quinn called Wyatt and told him to take advantage of his opportunity, and was later thrilled to learn that Wyatt and Hope had gotten married on Bill's yacht in Monte Carlo.
Quinn came home to find that Deacon had discovered a video Ricardo had made for Wyatt, which made several oblique references to Quinn; Deacon had been told by a detective that Ricardo was murdered, and when Deacon accused Quinn, she pointed a gun at him. Quinn claimed she was innocent of any wrongdoing regarding Ricardo, then told Deacon that she knew he wanted Brooke back and could help him win her. Quinn admitted she wanted Bill for herself and didn't want to see him reunite with Brooke, so she hatched a plot to keep them apart: she would get Ridge to do the dirty work for her. Quinn approached Ridge under the guise of making amends for her part in Bill dumping him out of the helicopter, then lifted discarded designs out of his wastebasket; the unintelligible scribbling told Quinn that Bill had caused Ridge to lose his designing ability. Quinn attended Wyatt's homecoming party, where she sent Deacon to tell Brooke the truth about Ridge. Quinn was happy when Brooke once again put distance between herself and Bill.
Quinn was relieved when Bill found out how she'd pushed Ivy into the Seine but opted to keep quiet about it. When Charlie unearthed security footage of Quinn's actions against Ivy, which led to Quinn's exposure, Quinn merely stated she had done everyone a favor. Both Quinn and Deacon were disappointed when it seemed that Bill and Brooke were determined to make a go of their relationship, so they fell into bed together themselves and began a casual relationship.
Quinn learned that Wyatt and Hope were expecting a baby and raced over to embrace her role as grandmother. However, after Hope made it clear Quinn wasn't going to be a part of her child's life, Quinn threatened Hope, then downplayed it when Hope told Wyatt about it. Quinn was further annoyed when Hope refused to abide her relationship with Deacon; Hope told her father he'd have to choose between her and Quinn. Deacon was ready to choose Hope, but Quinn seduced Deacon back to her side.
Obsessed with having Hope accept her and include her in her grandchild's life, Quinn donned hospital scrubs and sneaked into Hope's first ultrasound, horrifying the girl to the point she promised to get a restraining order. Later, Quinn fantasized about Hope giving birth to a baby-sized Quinn, and also about tying Hope up and torturing her until she let her be a grandmother to Wyatt's child. Upon hearing that Hope still had feelings for Liam, Quinn encouraged Wyatt to build up Liam's burgeoning relationship with Ivy during a trip to Amsterdam so Liam would no longer be an option for Hope. At Thanksgiving, Quinn chipperly showed up at the Forrester celebration with a favorite dish of Wyatt's, but Hope and Liam presented a united front and sent Quinn away.
Despite both Deacon and Wyatt insisting that she stay away from Hope, Quinn remained fixated on having a place in her grandson's life. Quinn broke into Eric's house so she could observe Hope's baby shower, fantasizing about Hope welcoming her into the family. After Liam discovered she had been there and went to Hope about it, Quinn visited Hope at Brooke's house to again plead her case. Hope went ballistic, so Quinn finally told her she'd back off; as she was leaving, she heard a scream -- Hope had fallen down Brooke's steep backyard staircase. Everyone thought Quinn had pushed Hope, and Quinn was horrified to learn Hope miscarried the baby. Blaming herself, Quinn stood at the edge of Quinn Artisan Jewelers' roof, where Bill encouraged her to jump. Deacon, who was furious that Quinn had refused to stay away from his daughter, talked Quinn down and stuck by her anyway.
After Hope left to join Brooke, who was working in Milan, Italy, Quinn convinced her estranged son to follow Hope and patch up their marriage. But when Brooke came home alone and reported that Hope was still angry with Wyatt, Quinn railed at what she perceived as Hope's mistreatment of her son until Brooke stung Quinn by blaming her for the miscarriage. Quinn was concerned that Deacon might want to return to the now-single Brooke, but Deacon assured Quinn he was all hers. When Deacon tried to help Brooke, who was drinking heavily, Quinn told the concerned Wyatt she was all right with it, yet stormed over to Brooke's place to warn her to stay away from Deacon, slapping Brooke so hard she fell to the ground.
Quinn was surprised that Deacon didn't leave her for smacking Brooke, and even more so when Deacon presented Quinn with an engagement ring. Quinn quickly threw the engagement in Brooke's face, enraged when Brooke vowed the wedding wouldn't happen. Meanwhile, Quinn comforted Wyatt, who had instigated a divorce from Hope and professed to being more like his mother than he realized.
Quinn listened as Deacon admitted he was a functional alcoholic; when Deacon said he wanted to get back to the A.A. meetings he used to attend in light of their coming nuptials, Quinn also stopped drinking in a show of solidarity, and expressed pride when Deacon spent time with a fellow alcoholic in an effort to keep "śhim"ť sober; Quinn declined to ask the identity of Deacon's friend out of respect for A.A.'s anonymity rule. Later, Quinn was overjoyed when Forrester Creations' CEO, Rick Forrester, offered Quinn her old job back and put her to work with Ivy.
Smelling Brooke's perfume on Deacon, Quinn realized they were in A.A. together; though Quinn cheerily told them she was all right with them offering each other support in their sobriety, Quinn fantasized about stabbing Brooke after Wyatt overheard Deacon and Brooke saying they would act on their feelings and reunite if Deacon wasn't engaged to Quinn. Not wanting to be Deacon's second choice, Quinn demanded that he drop Brooke as a friend. Deacon's reassurances comforting her, Quinn invited everyone to her wedding, but no one would attend but Forrester lawyer Carter Walton, who, as an ordained minister, agreed to officiate.
With Wyatt as their only supporter, Quinn was about to exchange vows with Deacon when Brooke burst in, patching Hope in on a video call. It hurt Quinn that Hope begged her father not to marry her, but Quinn was thrilled when Deacon took Quinn's side and married her anyway. The newlywed Sharpes enjoyed a quiet honeymoon at home.
Having developed a working relationship with the Australian Ivy, Quinn encouraged Ivy to marry Liam after an immigration official told Ivy she was about to be deported for not maintaining legal citizenship status in the U.S. What Ivy didn't know was that Wyatt had shown an interest in Steffy, who had her heart set on reuniting with Liam herself, so Quinn happily ran interference. After Liam and Ivy were wed, Ivy found out her marriage wasn't necessary because she had dual citizenship after all; Quinn advised Ivy to keep her mouth shut. Later, during Forrester's California Freedom fashion show, Quinn was none too happy to spy Deacon talking to Brooke.