Jennifer Ehle appeared as Sister Mary O'Connor in 1923, a prequel to the Yellowstone series. Sister Mary is an Irish Catholic nun who teaches at the School for American Indians in Montana. She is the central character in the show's focus on the brutal assimilation policies visited upon Native American children during the early 20th century.
As an abusive and hard-line figure, Sister Mary seeks to impose cultural erasure by violent and oppressive means. Her encounters with Teonna Rainwater, an Indigenous child, bring to light the institutional injustices experienced by Native people.
Sister Mary O'Connor: A complex villain in 1923
Sister Mary O'Connor is a severely flawed individual formed by her absolute faith in forced assimilation. She holds to the policy of "killing the Indian to save the man," a rationale that explains erasing the Native children's cultural identity.

Jennifer Ehle has explained Sister Mary as an individual who sincerely feels that she is doing these children a favor, though what she does stems from ignorance and cruelty. As a nun, Sister Mary uses her power in the form of physical and emotional abuse.
In one chilling scene in the series pilot, she reprimands Teonna Rainwater for a wrong answer by pummeling her hands with a ruler. It is a textbook example of her strict adherence to discipline and of her as a systemic oppressor. Sister Mary's character is not just that of a two-dimensional evil character but of a symbol of institutionalized thinking that rises to such horrors.
Her relationship with Father Renaud, the school headmaster, is another rich addition to her character. Although she wields power over students, she, too, is abused by Father Renaud. This establishes how hierarchical oppression systems tend to victimize even those who administer them.
The conflict with Teonna Rainwater in 1923
The dynamic between Sister Mary and Teonna Rainwater is key to 1923's boarding school subplot. Teonna, played by Aminah Nieves, is a tough-as-nails youngster who will not abide by Sister Mary's suffocating regime. The encounters between the two are characterized by tension rising to a boiling point as Teonna fights back against efforts to erase her.
At a turning point, Teonna rebukes Sister Mary's abuse in a violent showdown that establishes their dynamic. Her defiance highlights Teonna's toughness and resolve to persevere despite being in a world that has constructed itself around the purpose of crushing her soul.
The tensions boil over when Teonna gets lethal revenge against Sister Mary in a gruesome and surprising scene. With a homemade weapon—a pillowcase full of books—Teonna assaults Sister Mary while she sleeps, eventually choking her to death and burning her face with a hot ruler.

The act of revenge is both cathartic and disturbing, echoing the desperation and trauma felt by Indigenous children in these institutions. It also brings an end to Sister Mary's character in the series while being a turning point for Teonna's character.
Historical context and representation
Sister Mary's narrative is rooted in historical fact. Between 1819 and 1969, thousands of Native American children were taken from their families and sent to government-funded, church-operated boarding schools throughout North America.
The schools sought to assimilate Indigenous children into Western society by eliminating their language, customs, and identities. Physical and emotional abuse were common, and countless children died as a result of neglect or maltreatment. 1923 employs characters such as Sister Mary to illuminate these somber pages of history.
Through the depiction of the violence of these schools in unflinching truth, 1923 aims to inform its audience about the systemic injustices perpetrated against Native peoples. Jennifer Ehle's acting conveys the rigidity and internal struggle of someone who is an accomplice to such a system but feels that they are acting in good conscience.
The presence of cultural advisors on the set guaranteed that these narratives were brought to life in an authentic, respectful manner concerning Indigenous viewpoints. This dedication infuses depth to Sister Mary's character and adds a larger layer of meaning to her actions set within the historic period.
1923 is available to watch on Paramount+.

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