As far as leaving a review on MM: I don't use MM, but it would seem to me that if this specific snake was listed on MM, as opposed to just the seller having a presence there but not listing this animal, I think that makes all the difference. And I'd be especially suspicious of this snake if she wasn't listed there- maybe they were just flipping her, or already knew something was amiss, which is my suspicion.

I'd go the extra mile for the histology too. Not surprising she was dehydrated, at the rate she kept losing fluid. So she was submitted frozen then, not just refrigerated?

I wonder what was causing the melena?