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Before she became an actress, she received improvisation training as a member of The Groundlings in San Jose. She studied acting and dance at the University of Utah. Her role models are Lucille Ball, Tracey Ullman, and Carol Burnett. She rose to fame for playing Audrey Parker-Nichols in the hit Nickelodeon sitcom Drake & Josh. On The Amanda Show, she played various characters such as Marcy Stimple, Mrs. Klutz, Ms. DeBoat, and other various teachers, as well as adult defendants in "Judge Trudy" and customers for "Blockblister" and "...Dooper" sketches.
Sullivan has also appeared in many commercials including Price Chopper supermarket chain and the Consumer Cellular wireless carrier.