Fantômette (1999)

Fantômette is a French  based on the novel series of the same name by Georges Chaulet.

Françoise Dupont, is a 12 year old girl who dresses up as a superheroine named Fantômette in order to fight crime. She has two sidekicks: Ficelle, a tall and not-very-bright blonde, and Boulotte, a short and chubby brunette who is fixated on food. Neither of them are aware of her secret identity, despite meeting Fantomette regularly.