Where are the girl superheroes?

There really is an appalling shortage of girl superheroes. I knew that in theory before we had a daughter, but bedtime storytelling needs have made it glaringly obvious.

On the plus side, we've invented Iron Girl, Super Piya, Brave Captain Piya of the Sea of a Thousand Islands, etc.

If only Joss Whedon could invent a superheroine who doesn't suffer horribly and die.