This is horribly common and it makes us boil! Pet shops have no business stocking and selling animals they have no clue how to care for! Their poor or nonexistent husbandry info gets passed on to customers who then take their pets home to end up sick or dying. I know you had the best intentions by buying her, but unfortunately you also handed the shop a "reward" for stocking a cham. They got their money out of her and may just get a replacement. The cycle repeats. A good rule of thumb for the future....if you really want to rescue an animal from a bad shop, explain what's wrong with their care, point out any illnesses or injuries the animal has, and offer to take it off their hands for little or nothing (saying it needs vet care and you are willing to take it on). This way the shop doesn't have as much incentive to sell more.