If you look at it that way, the answer to Peter Pan is that a girl who tries to be Peter Pan will ruin everything for everyone.

Tying the disintegration of the island to the explicit onset of the protagonist's menses also doesn't seem to support the idea that the transition into adolescence is normal and inevitable as opposed to a punishment especially for female-bodied children.

[edit] I'm just really stuck on how punitive the entire book sounds. Like, I've met less heavy-handed fairy tales.