Re: possible black mold exposure
The “green” description of the mucus makes me think bacterial over fungal, but I am not certain if that is always true. It definitely sounds like your little one has an infection if some sort. Do you happen to have any antibiotics laying around the house? Perhaps baytril/ciprofloxacin, augmentin/clavamox, amoxicillin, doxycycline? Either the human or animal versions should work. If you can find anything, someone here might be able to tell you if it is safe to use in squirrels and help you with appropriate dosing. As for the wet fur, can you tell if she is having diarrhea? Does the wetness trail up to the base of her tail or is it just that one isolated spot? For now I would definitely keep her in a warm dry environment if it is possible. Whether bacterial or fungal, her body is going to be compromised from trying to fight it.
“Some people talk to animals. Not many listen though. That's the problem.” -A.A Milne