First daughter of Kevin and Patricia Cuthbert, after his birth his parents moved to Longueuil, Quebec. Elisha grew up in Greenfield Park, near Montreal, a fact with which he began to master the French language, besides his native English. He started very young to the stage in 1989 model-girl several lines of products for young people. His first television appearance dates back to an episode of the television series Are You Afraid of the Dark?, Which earned the call to shoot a part in the film Dancing on the Moon in 1996. Gained popularity in 1998 when he turned thriller Airspeed, and the television series Popular Mechanics for Kids TV Show with Jay Baruchel. After graduating in 2000 at Centennial Regional High School, decided to move to Los Angeles to pursue a career as Hollywood. Was so engaged for the role of Kim Bauer, daughter of the agent Jack Bauer (played by Kiefer Sutherland) in the television series 24. At the same time, turned to the Canadian television movie Lucky Girl, for which interpretation was awarded a Gemini Award. After losing the part, went to Kirsten Dunst, Mary Jane Watson in the Spider-Man, Elisha began to turn small parts in movies like Old School and Love Actually - Love really. His first real leading role it played in 2004 in the film The Girl Next Door with Emile Hirsch, film which had controversial responses from critics. Then, by Paris Hilton and Chad Michael Murray turned in 2005 House of Wax, a remake of the homonymous film of 1953. Also in 2005, starred and co-produced the independent feature film The Quiet - Secrets, in which he plays Nina, a cheerleader victim of sexual abuse.
The last film that is interpreted the psychological thriller Captivity, 2007. Also participated in a Quiet Man movie and The Cat. In 2009, working in the television series The Forgotten, while in 2010, is the protagonist, alongside Zachary Knighton, the ABC television series Happy Endings