I agree with many of the posts. When you don't like your hair stylist, you get a new one. :) Get a second opinion and see a pediatric GI allergist one who does ELISA allergy testing. I talk about it on my family health column http://www.examiner.com/x-7158-Chicago-Family-Health-Exam...
Does she have any other sypmptoms of secondary food allergies or perhaps Celiac Disease? (I have that on my column too).
Take a good look, record what she eats (when she eats) and note how she reacts and is feeling, you may have good answers.
Good Luck,
J. W. MPH
Maternal and Child Health Educator
Chicago Examiner Family Health Expert