Ferrin played the younger version of Vanessa Redgrave's character Esther in the Hallmark Hall of Fame film The Locket.
Ferrin's most notable role to date is that of Jennifer Munson Kasnoff Donovan on the daytime soap opera As the World Turns, played from 2003 to 2006.
She portrayed Rebecca Mason, the deceased wife of lead character Tom Mason (Noah Wyle), in a dream episode of the TNT science-fiction drama series Falling Skies, on July 21, 2013; Ferrin appeared again on Falling Skies for the series' fifth-season premiere on June 28, 2015.
[8][9] In Steven Soderbergh's Mosaic, a murder mystery released in 2017 as an interactive iOS/Android app and then in 2018 as an HBO television drama,[10] Ferrin played Petra Neill, a point-of-view character.
[9] As of 2021, she began a recurring role on CBS' The Equalizer, playing Avery Grafton, a DA who is determined to seek out and stop Robyn McCall's vigilantism as it also threatens her political future.