Robertson started taking acting classes when she was ten, and had roles in local theater productions. Her first television guest appearances were in My Secret Identity and E.N.G.. She then appeared in Maniac Mansion from 1990–1993, playing Tina Edison, the eldest of three children of Dr. Fred Edison (Joe Flaherty). She did not debut on the big screen until her small role in the Brenton Spencer film Blown Away.　　In 1994 Robertson was cast as Clare Arnold in Fox series Beverly Hills, 90210, and played the role to 1997.[1] Her ex-boyfriend, director Gregg Araki, cast her in two of his films, Nowhere (1997) and Splendor (1999).　　Robertson has appeared in several films during her career. She appeared opposite Luke Wilson in romantic comedy Dog Park (1998), in Sally Field's directed Beautiful (2000), Scary Movie 2 (2001), and independent film XX/XY (2002) with Mark Ruffalo.[1] She also starred in the short-lived Fox drama series Girls Club created by David E. Kelley in 2002.[1] In the Spring of 2013, Robertson portrayed the wife of hockey legend Gordie Howe in the made-for-television movie, Mr. Hockey: The Gordie Howe Story. The biopic first aired in late April on CBC, and then made its US debut on the Hallmark Channel the first week in May of that year.