Her career as an actress started when she was 9, guest starring in several television shows such as 'Til Death, FlashForward, and Hawaii Five-0; in 2010, she was cast in the role of Renesmee Cullen in the movie adaptation of Stephenie Meyer's book Breaking Dawn, fourth and final of the Twilight saga novel series. The first movie, The Twilight Saga: Breaking Dawn - Part 1, in which Renesmee is only shown in a flash forward, was released on November 18, 2011, while the second one, The Twilight Saga: Breaking Dawn - Part 2, on November 16, 2012.
Foy co-starred in Christopher Nolan's film Interstellar (2014)