Who is your local vet? Do you have a reptile specialist near you? Regardless of what she's doing, or how she's acting, you should take her in for a check up. The excessive thirst is certainly a concern. Chronic dehydration can also lead to death. I lost my male, Echo, to a stomach torsion and he did vomit once, and had these strange coughing/wretching episodes for a couple of weeks. Then he went off food, but drank a lot. Poor thing ended up with a horrible and painful death. I had him to the vet 3 times, and it wasn't until after he passed that we discovered the problem. The necropsy showed that his stomach twisted where it connected to his intestines. I am not telling you all of this to scare you, but your cham os showing some concerning symptoms and you should have her checked out sooner than later.
