Sweeney broke through with HBO’s Euphoria (2019–present), where her portrayal of Cassie Howard—a teen grappling with insecurity and heartbreak—earned critical acclaim. Her ability to balance fragility and fire made Cassie one of the show’s most talked-about characters, showcasing her gift for raw, authentic performances.

She quickly expanded into diverse projects. In 2021, she starred in The White Lotus, adding dark humor to her range, and 2023’s Anyone but You saw her thrive in romantic comedy, displaying sparkling chemistry opposite Glen Powell. Beyond acting, she launched her production company, Fifty-Fifty Films, aiming to tell stories that resonate with her generation.

Proud of her Spokane roots, Sweeney often credits her small-town upbringing with teaching her work ethic. She’s spoken about driving to Los Angeles for auditions as a teen, a persistence that now defines her career. Her versatility—shifting from intense dramas to lighthearted rom-coms—has made her a sought-after talent, while her producing work lets her shape narratives from behind the scenes.

With upcoming roles in a superhero film and more producing projects, Sweeney shows no signs of slowing. Colleagues praise her dedication; audiences connect with her authenticity. From Spokane to Hollywood, she’s proving to be more than an actor—she’s a creative force building her own path.