I don't have any ideas of what you can do on your own. I feel that at a time like this you need a good vet. Check out these links to find one near you that specializes in herps www.herpvetconnection.com/ or
http://www.arav.org/USMembers.htm and have a fecal done.
I am guessing that you are dealing with either parasites or maybe a blockage from the bark bedding.
You don't mention what she has been eating but it is possible that if she eats crickets or nightcrawlers that the bark could be ingested with either feeder and would not be digested. It is also possible that she could be egg bound but if this were the case you would have noticed that she were fat and at one time or another lumpy looking.
If her skin looks loose and she is laying on the ground she is very ill. Reptiles don't usually show symptoms of illness until they are very near death. So, it is very important that you have the evaluation of a vet if you are to save her at this point. You can try to force feed her but there is some risk of food going into the lungs and causing respiratory infection if she doesn't eat it willingly. If the underlying illness isn't treated force-feeding will not do anything to cure her either.
I don't believe this is something that you can treat yourself. I have been working with my MHDs for several years now. I don't have a vet nearby. The vet in town is afraid of reptiles and the closest reptile vet is a 2 hour's drive away. I still mail a fecal sample to the reptile vet at least once a year for each of my groups to make sure they don't need to be treated for parasites. Since they eat live food there is always the chance they can become infected with parasites.
If they ever show signs of illness between their annual checks, I send in a sample and have them checked as a precaution. If I get a new animal, I send in a sample. I am very lucky to be able to do this through the mail instead of having to make the 4 hour round trip but if I couldn't mail it, I would make the drive. Before the vet and I had met a few times I did. That is what you do for a pet when you aren't qualified to diagnose it yourself.
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Marcia - FroggieB Dragons
www.froggieb.com/MHDHome.html