And Rapunzel. Wendy wants to stay young and live in her adventures of Peter Pan, and Snow White and Rapunzel act the youngest and would be the ones who wanted to take part in those adventures the most, I think. Maybe Ariel.

Because much like Wendy Belle enjoys literature and loves to dream of adventures. Moreover, Belle and caring and delicate, like Wendy.

Or Belle for basically what the comment above stated. But I think Cinderella would find her charming and polite which she would not be used to living in a house with those nasty people.

Basically I think she'd like Cinderella, Aurora, Rapunzel, Belle, Snow White, and Ariel (before she sold her voice).

Also Snow White, Aurora, Rapunzel and Ariel.