To me it seems like a slam dunk diagnosis, and the actual confirmation should be recovery on a gluten-free diet. If her symptoms improve on the diet, it would be final confirmation that she has celiac disease--and likely DH as well.

Thank you for all your help! We agreed with the pediatrician that if further testing is necessary we will reintroduce. Given all the evidence I would never put her out for an endoscopy even if recommended by the GI.  So today I'm purging the kitchen and cleaning.

The blistery rash is almost certainly dermatitis herpetiformis, a classic indicator of celaic disease and for which celiac disease is the only known cause. There really isn't much doubt that she has celiac disease given all the evidence so far.

Thank you! Hers were much higher than 10x plus positive ema. Plus anemia, rash, low vitamin d. The GI appointment isn't till middle of April but the pediatrician said to go ahead and stop gluten as there is no question. We went ahead and she hasn't had gluten for about 36 hours. This morning her rash wasn't blistery for the first morning since it started. 

It is shocking that you were apparently not informed about this positive celiac disease test. In the Europe the protocol for making a celiac disease diagnosis in children is if their tTg-IgA (tissue transglutaminase IgA) levels are 10 times or above the positive level for celiac disease. According to the latest research, if the blood test results are at certain high levels that range between 5-10 times the reference range for a positive celiac disease diagnosis, it may not be necessary to confirm the results using an endoscopy/biopsy: Blood Test Alone Can Diagnose Celiac Disease in Most Children and Adults TGA-IgA at or Above Five Times Normal Limit in Kids Indicates Celiac Disease in Nearly All Cases No More Biopsies to Diagnose Celiac Disease in Children!