Lost Odyssey damage, or as the French say, "dam-ahhhhhjjjjj" - take it to one of the lovely Japanese used games shops, and they'll use their professional refinishing tool to make it look like new for ¥500 or so.
Then hide your 360 a little better. Mine is behind the TV, fully benefiting from its wirelessness.
Sickness: you're fucked. Wash your hands and her hands too as frequently as you can, especially when you come back from a public place where lots of kids play, but you're basically screwed. After a couple years, you've caught most of the strains and your immune system is all hulked out. I've seen what you eat, it's pretty healthy, so you're not lacking in vitamins or antioxidants or suchlike.
Or you can ply your daughter with single malts so she has no urge to play with other kids anymore.