She played the part of Debbie Berwick on Phil of the Future, as well as having starring roles in the Disney Channel Original Movies such as Life Is Ruff as Emily Watson, A Modern Twain Story: The Prince and the Pauper as Elizabeth, and Read It and Weep as Jamie Bartlett. She is also on the Disney Channel Games of 2006 on the Red team. She also played Emma Anderson in the Grey's Anatomy episode "All By Myself" and Daphne Nicole Powell in the ABC TV show No Ordinary Family. She even voiced Rosa in Beverly Hills Chihuahua 3: Viva la Fiesta, as well as playing Samantha Caldone in Cyberbully.
In 2012, Kay retired from acting. She eventually went on to study zoology at UCLA. She now works as a zookeeper at Disney's Animal Kingdom.