ok i will, but why? what does gluten do?
Here's a ref: Celiac disease - sprue - PubMed Health (or google more info).
Gluten and other food allergies seem to be some of the most common (anecdotally speaking) sources of issues w/ nutrition / digestion that people don't know about.
As mentioned, it would be useful to see a typical day's meal plan - e.g. does she eat a lot of wheat (gluten)- based food, for example wheat bread, etc.?