Just cleaning your house alone was probably quite a workout! When I cleaned my small apartment a few days ago I was breaking a sweat! And painting-oy, there's a nice arm workout! I wanted to do a black and maroon scheme in my bedroom when I first got my apartment, but they're both very hard colors to paint, not to mention an eyesore after a few weeks...luckily I realized and changed my mind. Now I have a nice lilac decor going on, much more soothing. Good luck with changing your daughter's mind! Maybe you should suggest doing a sponge paint technique, like saying she can have a magenta-ish background and then you can sponge a pretty pink over it to soften it or something.