Hives, ouch. I'm sorry -- but at least it sounds as if you know how to make sure you avoid them, while still enjoying favorite foods.
You know, the more I read about food allergies, the more I wonder if I had them as a child. I used to have asthma, hives, eczema -- and from what I'm reading, those are often linked to childhood food allergies, especially dairy. I guess they didn't know much about that back then (I just turned forty), because I don't remember it being discussed even as a possibility. I was just the kid who was always sick.
I'm so glad that we're learning more about allergies now -- but it's a shame that this knowledge seems to be coming along largely because food allergies are becoming so widespread.
I'm sure your daughter already knows this, but high-quality chocolate (especially dark) seems to be a better bet for allergy sufferers.