On June 16, 2011, Martin appeared for one night in Super Summer Theatre's live production of 'Annie' at Spring Mountain Ranch in Las Vegas, Nevada, in the role of Star-To-Be. Martin also played the role of Aubrey in the film Sironia.

In 2011, Martin played the main character Jo Mitchell in the television film Mean Girls 2, the sequel of the 2004 film Mean Girls. Martin returned to reprise her role as Tess Tyler in Camp Rock 2: The Final Jam, premiered on September 3, 2010, on Disney Channel. She also had the role of Megan Kennedy in the independent film Dear Lemon Lima. Martin starred in the ABC Family sitcom 10 Things I Hate About You as Bianca (originated by Larisa Oleynik in the film version). Martin voiced the character Naminé in all subsequent releases in Kingdom Hearts series, replacing Brittany Snow, who did not return to the series. She was the online host for the 2008 Disney Channel Games. Martin was selected by TV Guide in 2008, as one of the '13 Hottest Young Stars to Watch'. Martin eventually cast as the lead antagonist Tess Tyler in the Disney Channel original movie, Camp Rock, starring Demi Lovato and the Jonas Brothers. Martin started her acting career in 2007, such as the television programs Nickelodeon's Just Jordan and CBS's Close to Home, as well as a guest stint in the Disney Channel series The Suite Life of Zack & Cody. She appeared in several television commercials such as for Cabbage Patch Kids and Barbie.

Martin also appeared in several community theatre productions in Las Vegas such as Peter Pan and performed for her Showteam and later made her professional theatre debut in a Los Angeles production of 13. Martin was born in Las Vegas, Nevada and has two brothers and one sister.

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