You have a heart of gold. Let me try to put your mind at rest; Miss Mae is now in a hospital. Under the care of medical professionals. Even if she slipped into a coma as the result of her condition, the fact that she once before recovered from the same, would prevent her IMO from being removed from the care of her physician. Remember, the rules of admittance to a hospice are that she has only six months at the most to live. Ask yourself, under what circumstances would her current physician sign such an admittance form?
You are right, she should be OK. I went back and took a look at Mae's living will (and posted a portion of the document in my post #2,327).
I'm not a lawyer, but I got the impression that Mae can't be starved and dehydrated if she is PVS or in a coma, but that she could be if she was declared terminally ill. (Which might explain why Gaddy fought so hard to keep Mae in the hospice.)