You know how to do the skin test on her, right? Gently pull her skin up and if it snaps back right away, she isn't dehydrated but if it stays that way, she is. Sometimes they don't appear to be dehydrated but they are. I can't imagine that she's vomited so much and isn't but you're there w/her and I'm not, so you know better. Sweet little Luna, I wish we could figure out what's wrong.