female cham pass away

[snk]

my female cham pass away yesterday, i do not know the cause of her death, however, there was a patch of skin turn yellowish at her left belly near the back leg, she was not eating well for 2 days, i offer her wax worm but she poo them out without digesting them, she is on the floor after third day that i found she is not eating well, and pass away the same mornning. she is about 10month old and no sign of gravid. hope some one could tell me what is the cause of her death if any one of you know, thanks