Marky beat me posting X-men, but here's the rest of what I had to say in case it helps.
There's more, but I just can't think of them right now. Also, there are a few threads for games with young kids she may like, but I can't think of them right now either. Try the search and if I get a chance later I'll try to post the links to the ones I was thinking of.
Have you tried any of the more gender neutral games or does she definitely gravitate towards the female characters.