Hillary is someone Pete worries about during the body-exchange crisis. The summary provides no scene, dialogue, or specific relationship beyond Pete's concern, so her role is limited in the described plot and cannot be characterized more precisely without inventing information.
Allison Carter Thomas has 4 screen credits in a career dating back to 2009. Signature works include All Screwed Up, Oral Fixation, Prince of Broadway. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.