I think this happens no matter which colour DS you have. Your daughter's might be worse because of the type of games that she plays. I have just bought a pink DS but also have a white one. Do you use screen protectors? They are really good, and once they get scratched up you can just peel them off and put new ones on. Once you've scratched up the actual screen, there's nothing you can do about it except replace the whole thing so I'd really recommend the screen protectors. The best ones I've come across are the GAME ones.