In February 2012, she joined the cast of James Wan's horror film The Conjuring. Shooting on the film began in February 2012 in North Carolina, and it was released in July 2013. In February, she was also in the last episode of the second season of the horror TV series R. L. Stine's The Haunting Hour, in which she played Natalie, a girl who goes to live with her grandfather and discovers that one of the dolls is alive and has bad intentions.
On October 10, 2012, Foy joined Wish You Well, the film adaptation of David Baldacci's book, where she played the lead. On November 17, 2012, Foy was in another episode of R. L. Stine's The Haunting Hour, playing Georgia Lomin. In 2014, Foy appeared in Erica Dunton's movie Black Eyed Dog.