She graduated from Princeton University with a Bachelor of Arts in Religious studies.
She is best known for playing the role of Wendy Greenhut in the 2008 film College Road Trip, and as Ali in Paranormal Activity 2 (2010) and Paranormal Activity: The Marked Ones (2014). She currently plays Mandy Baxter in the American Broadcasting Company sitcom Last Manitoba Standing, which premiered on October 11, 2011. She was raised in Buckinghamshire County, Pennsylvania.
She performed in shows at the Buckinghamshire County Playhouse as a child and in professional productions at the Prince Music Theater and Arden Theatre Company in Philadelphia as a teenager.
Ephraim was raised Jewish. Theater Screen Ephraim played Wendy Greenhut in the 2008 film College Road Trip.
She had roles in episodes of the television shows Royal Pains (2009), Law & Order (2008), the Michael J. Fox-produced pilot Hench at Home (2003), and in the Home Box Office pilot, The Wonderful Maladys. Ephraim also played Ali Rey in the 2010 film Paranormal Activity 2 and the 2014 spin-off film Paranormal Activity: The Marked Ones.
She currently appears as Mandy Baxter, one of Tim Allen"s character"s daughters, in the American Broadcasting Company sitcom Last Manitoba Standing.
At Princeton she was a member of the Triangle Club and performed in and choreographed various shows for Princeton University Players and Theatre Intime.