From 1990 to 1993, Robertson starred as Tina Edison, the eldest of three children of Dr. Fred Edison (Joe Flaherty), on the Canadian sitcom "Maniac Mansion". This role earned her two nominations for Young Artist Awards. She appeared in several small films and television shows, and did not debut on the big screen until her small role in the 1992 thriller film "Blown Away", opposite Corey Haim and Nicole Eggert. She also made her American debut in the 1992 made-for-television movie, "Quiet Killer", co-starring Kate Jackson.