Wasilewski's first role came in the 1994 Japanese animated film Heisei Tanuki Gassen Ponpoko, where she was one of the additional voices dubbing in English. She can mimic Rosie O'Donnell's voice which was perfect for animations such as The Legend of Tarzan and Queer Duck: The Movie. She voiced Tuck, Misty, XJ-7 and XJ-8 on the Nickelodeon animated series My Life as a Teenage Robot in 2003, and also voiced Laura in Scooby-Doo and the Alien Invaders. She voices a Veterinarian named Dr. Glove in Back at the Barnyard. In 2007, she voiced Garfield's love interest Arlene in the animated direct-to-video film Garfield Gets Real, and reprised the character on The Garfield Show, the following year. Wasilewski is also the voice of Bessie in Random! Cartoons, had a recurring role as Barb in Sym-Bionic Titan, and she also voices Terk in a Tarzan video game. She voiced Ortensia, Oswald the Lucky Rabbit's cat wife in Epic Mickey 2: The Power of Two, and the League of Assassins member in Batman: Arkham City. She is currently voicing Police Chief Rambamboo for Nickelodeon's Breadwinners and Katrina Shanks in the radio drama Adventures in Odyssey. She also voiced characters in Disney Infinity 3.0 and Skylanders: SuperChargers.