My chinese water dragon is brown and green and lost a finger what is going on?

my chinese water dragon is green and brown and last time she shedded she looked green after but her tale still has alot of brown and it lost a finger last week one of the fingers had been hanging for a while and now completely is offf when i first got herr she was misssing one.... i feed her crickets only is that why? please help me help her im worried to try and help ive given her more cage space? because she runs around on the cage a lot i think thats why her finger fell off but i took out one of her little trees and i took off the top of her cage and leave it open now because maybe its too hot? please i need answers on what to dooo!.