If you daughter does have celiac disease, what a blessing that she finds out now, when she's young, instead of suffering through her whole life wondering what's wrong. I have 2 friends of mine who didn't find out they had celiac until they were in their 20s and 30s!!! One of them suffered from infertility for years, and they had stopped trying for a baby. At a completely unrelated doctors visit, she told them about the bowel and stomach issues and was tested for celiac and turned out to have it -- once she went off of gluten (completely 100%), a year later, she became pregnant without any help -- likely due to her body healing from the major damage that gluten was doing to it.
So... a few things to know about celiac - it runs in families, is genetic! Gluten acts like a poison to the body, affecting everything from digestion to the nervous system. In people with undiagnosed celiac (who are eating gluten over their lifetime), the rates of bowel cancer are significantly higher.
So, if your daughter is positive, please check you and your husband (assuming you're her bio parents) for celiac as well, since either one or both of you is carrying a gene for this AND is likely intolerant to gluten too. Probably best for the whole family to adopt a gluten-free diet for *at least* 6 months and watch how the health of the family improves!
Here's a good link for gluten-free, dairy-free recipes (probably best to keep your daughter off of all cow's milk for a while, too, along with going gluten-free, because her gut is likely damaged from the gluten and so is also likely to be unable to tolerate cow's milk):
http://www.paleofood.com/
And check out the gluten-free bloggers - some great, yummy recipes, and lots of inspiration and hope that making this diet change (gluten free) is really a new beginning, not some horrible deprivation! Just two examples:
http://glutenfreegirl.blogspot.com/2007/05/do-you-have-ce...
http://www.glutenfreeorganics.blogspot.com/
And definitely join online forums where those with celiac hang out, and specifically, parents who have children with celiac hang out so that you can get good tips and advice from them - it will be important for you to be very informed about celiac so that you can help your daughter's doctors understand, because A LOT of them just aren't familiar with it or "don't get it".
Best of luck, and again, look at this as a really lucky discovery - it could mean vastly improved health for your daughter and your whole family!