She was played by Jodelle Ferland, whom best known for playing Lillith in the horror film Case 39, Alessa Gillespie in Silent Hill film, Bree Tanner from Twilight: Eclipse, and Aggie Prenderghast from Paranorman.
Audrey is the childhood best friend of the film's main protagonist, Peyton Harris, whose life unravels due to nude photos of her being released online. As revealed in the midst of the film, Audrey actually sent Peyton's photos (which Peyton saved and deleted while considering getting breast implants) to a website, which ended up going to another website ran by Carl Cook (the film's main antagonist) called exmyex.com. Audrey confessed to Peyton about the act at a party (which Audrey didn't tell Peyton about), and regarding her reasons, she had harbored jealousy of Peyton, due to Peyton excelling at everything and finishing ahead of her. Audrey sent the photos while she and Peyton were in Peyton's room, doing so while Peyton's back was turned. Though she was shocked to see the photos, Audrey sent them online anyway, calling what she did a "horrible impulse." She also told her that she deleted the photos from the website as soon as she could, but by that point, it was too late.
Despite her tearful pleas for forgiveness, Peyton rejected them and storms away, effectively ending their friendship.