Growing up in Hamilton, Ontario, Canada, Robertson began her training in acting, voice, and dance at the age of 10. She landed her first major role as Tina Edison in the TV series "Maniac Mansions" while still in her teens. However, it was her portrayal of Clare Arnold on "Beverly Hills 90210" that gained her widespread recognition. Robertson has since starred in various films and TV shows, including "Scary Movie 2" and "Murder in the First". She has also taken on more challenging roles, such as her character in the independent film "XX/YY".