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VanderWaal made her acting debut in the 2019 film "Stargirl," based on the 2000 novel of the same name by Jerry Spinelli. In the film, VanderWaal portrays the title character, Susan "Stargirl" Caraway, a quirky and eccentric high school student who befriends a new student named Leo Borlock. The film was a critical and commercial success, and VanderWaal's performance was praised by critics.