She is best known for her role as Fiona "Fi" Phillips in the Disney Channel Original Series So Weird.
Later she had guest spots on Mad About You, 7th Heaven, The West Wing (in "The Stackhouse Filibuster"), Strong Medicine, and ER.
She has also starred in several TV movies and had minor roles in several motion pictures such as Sleepless in Seattle and Avalon.
In her breakout role on So Weird, DeLizia played Fiona "Fi" Phillips, an adolescent girl obsessed with the paranormal.
DeLizia's other major role was as Marcy Kendall on the FOX drama Boston Public, where she played the assistant to Chi McBride's Principal Harper.