Campbell's career started with acting in television commercials at a young age.
[3] Campbell made two guest appearances on CTV's hit show, Cold Squad.
[6][7] In 2004, she starred in the small indie-film, Pursued, opposite Gil Bellows, Michael Clarke Duncan and Christian Slater.
Her feature film debut ultimately came with Scary Movie 4,[9] which set a box office record for Easter weekend 2006.
[15] In 2008 for her guest role of Maggie Thompson on the series Supernatural, episode: "Playthings", she was nominated for a Young Artist Award in the category of Best Performance in a TV Movie, Miniseries or Special: Supporting Young Actress.