Well, early on there are definitely some things we can try to do to turn it around. Chief among these would be a gluten-free diet, which can sometimes reverse it.
Unfortunately, this is my least-compliant child. My H (who has a "tough it out" mentality about every illness) has encouraged her in this. It will be tough enough to get her to have the right tests done when she gets home; actually getting her to take supplements or go gluten-free will be tough. My best bet is to work on h, and then have HIM make the recommendations to her.