Show love, tolerance and respect to everyone.
Cartoons for girls don't have to be a puddle of smooshy, cutesy-wootsy, goody-two-shoeness. Girls like stories with real conflict; girls are smart enough to understand complex plots; girls aren't as easily frightened as everyone seems to think.
Think you can't write women? Don't. Write people and make them women.
There's more than one way to be a girl
I do think it's good to remember that childish things are made for children, and that, however pleasantly lurid the promise of a return to the clarity of childhood may be, an infatuation with the childish reveals only that one has failed to grow past it.