I really feel your angst! I want to spit nails on your behalf!!!
First, I think the docs need to acknowledge that they may need to look further than Celiac's as a diagnosis. My son had all of the classic symptoms of Celiac's and endend up having Crohn's Disease. It took over a year for them to run all of tests to "rule things in/out" until they finally had the right dx and we could begin to move forward.
The vomiting blood is very concerning. I would expect the doctors to be more concerned about her symptoms than what you have shared. With Crohn's, the labs are nearly useless in determining/predicting flares or disease status. If your doctor is relying solely on labs, FIND A NEW DOCTOR and quickly.
In my sons case, the MRE is really the only test that ever gives the doctor a good/true picture of what is going on inside his ileum and colon. That said, I am a huge fan of the pill camera. Not because the camera ever gave us the data the doctors were looking for, but because both times he swallowed the pill camera it got stuck. When the camera is stuck, they HAVE TO go in to get it. When the surgeons go in to get the camera, it's like magic...suddenly everything makes sense and the GI doc sheepishly has to come to you and explain how messed-up your child's insides are. It's almost like an apology for not "getting it" sooner. Then the real magic happens...everyone (the GI doc, the surgeons, the pediatrician) understands the true severity and nature of your child's disease and the doors to better access to tests, meds, etc... open wide! I truly believe that we would still be searching for answers (and looking in all of the wrong places), if it were not for that first pill camera getting caught in a section of strictures in the middle of my son's intestinal tract.
I'll be praying for both of you. For peace, for health and for the doctors to have sensitivity and wisdom.
Best wishes for you and your daughter.
Cheryl