sounds like she drank her water too fast to me...
this happens to zero alot, he will drink his water bone dry and he will blow up like a balloon, then vomit it all out... *and yes, he eats poo also, so its pretty gross most times*
I have had bloat experiance, and lost my dane, Zeus to it... and to me, if there is stuff coming up on its own, its probably just the water intake... If she is puking, i suggest taking the water away for a little bit let her relax... see how that goes? but if you are worried about it being bloat. see a vet immediately