Flagacyl is really really hard on the GI. In humans they use it to treat certain STD's oddly enough. I highly suggest Acidophiliz+. Ok next, is there another vet you can check with? Or better yet (as weird a question as this is going to be) is there a nature center or zoo near you? Often times they will have a herpetologist on staff who can at least nudge you in the right direction. What is that in the bottom of her cage?