Check out support groups online for the area. I'm pretty sure there are 2 or 3. I've looked because my family is in the Lake George area, and that was the closest I could find anything. My sister has had to take my neice to Albany for some of the testing. Her doctors are really messing around. 2 Positive blood tests. and they keep saying that they doubt she has Celiac, and they've been delaying a biopsy. What does it take? Meanwhile she's deathly ill, pale and growing tinier by the day.
Anyway.....I know there are a number of people not so far from you. After my diagnosis, my family members keep "running into" Celiace everywhere, and until last Nov. had never heard of it. We're out there.....just not wearing any banners and flags!
The blood tests can be "inconclusive" because the test looks for antibodies and the antibody level is strictly related to gluten consumption for that date. If I go a week without eating gluten my antibodies drop like a hot rock. There is no bacteria or virus to check so an elevated antibody level can only point your doctor towards Celiac.
However, the only true test is the Endoscopy. It takes much longer for damage to the digestive system to repair itself. EGD will show a doctor if those antibodies have flattened the villi in the Digestive System - a sure sign of Celiac. Tell your sister to demand an EGD and threaten to find a new doctor. Its terrible that in this day and age, we have to be our own advocates and push the doctors in the right direction.