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.)
I disagree. Take all of the extra language out, and here is what Mae signed on to:
If at any time I should become in a coma with no reasonable expectation of regaining consciousness, or become in a persistent vegetative state with no reasonable expectation of regaining significant cognitive function, I direct that the application of life-sustaining procedures to my body, including nourishment and hydration, be withheld or withdrawn and that I be permitted to die.