I had to go through an allergy diet as well, and I would in fact confirm whether she can have dairy or not. I was not allowed to, and that included margarine.
Avoiding a lot of these foods is not as hard as it seems if you are in total control of what gets put into your shopping cart. One of my favorite places to look for recipes is Eden Foods (
Eden Foods - Good Food Good Reason Health and Happiness), where you can search for recipes by diet restrictions.