Have you tried a gluten free diet?..along with the milk free? Gluten is in everything these days and I think damaging all of us. Also, preservatives, colors, high fructose corn syrup. I would suggest organic meats(Laura's meat at Target), organic fruits and vegetables, goat cheese (Whole Foods Market), and Ener G makes gluten free breads. Whole foods also sells coconut milk yogurt and ice cream(S.O. Delicious) Try it! You've got nothing to lose, it's very healthy. Keep it plain and simple. You can also get Lakewood Pure Juices at Whole Foods. I read the ingredients on everything and make sure I get nothing with additives, preservatives, colors. I hope she gets well soon!
Oh, and one last thought, do you(or her school)use hand sanitizers? There have been cases where little children are somehow ingesting this.