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.
Good Luck.