Prior to 90210 she appeared in Southland, Cold Case and Cupid. She played a recurring role in 90210 during the second season from 2009 to 2010, as a young Californian surfer named Ivy Sullivan. In February 2010, she was signed as a regular cast member for the third season of the show. In 2011, Zinser starred in the MTV movie thriller The Truth Below, as the sole leading female in a cast of men.
Zinser plays a confident 18-year-old whose world is upended, first by romantic misunderstandings, then by a crash that leaves her and three friends trapped under an avalanche. Zinser's other credits include Southland, Cold Case and Cupid.