Hi i just picked up a big breeding rat she pretty all smoke colored. She been here just 2 day but she had a rough night i guess.. Her cage got knocked over last night (she alone right) This morning she ate all the skin off the last inch of her tail.. and a bit of the tail its self.. Is she stressed from being alone or do you think the move then the fall did it? She nice as can be and is acting normal this morning... thanks