I agree with Yarvy!! She needs to see a vet ASAP. Your girl looks to be VERY ill. It is not a good sign that the back half of her body has turned black and she is sitting on her back legs in the second picture. A healthy cham will NOT sit like that, they will stand on all four legs even on solid ground.
Hopefully a vet can help her out, but she needs to be seen, last week.
In the first pic, she looks a bit bloated and unstable on her hind legs too, so something has been going on for a while. Chams are experts at hiding their problems until almost too late. I don't know how experienced your vet is, but she really needs a thorough exam including some sort of scan to check to see if there is some sort of internal impaction, egg binding, organ damage, or injuries. I hope the vet doesn't automatically give her calcium and Baytril "just in case" there's an infection going on. Probably more complicated than that. Poor little girl, I hope they can help!