The Washington native started her career at a young age as she booked commercials in Seattle and Portland, Oregon. She relocated to Los Angeles at the age of 14.
The actress got her start in the film industry in the horror movie Along Came the Devil. She went on to guest star on TV series, including, 90210, Criminal Minds, Grey’s Anatomy, In the Vault and Pretty Little Liars. She also had a recurring role in the second season of The Handmaid’s Tale.
In 2019, Sweeney got her big break when she was cast in Euphoria and earned an Emmy nomination for her role in the critically acclaimed drama series. She also appeared in the first season of The White Lotus and scored another Emmy nomination for her work in the HBO anthology series.
She and her longtime boyfriend, Chicago-based restaurateur Jonathan Davino, have been engaged since February 2022.