What are the options?
Is this woman able to move at all?
If it were me, I would try to get her to move around if possible so that she isn't in bed all day getting sores. If she cant move, roll her over every once in a while in bed if possible.
If she is refusing to drink water and cant chew food well, maybe blend the food up, and add a little water? If she still refuses this, you may just have to make her as comfortable as possible and keep trying to give her food and liquids.
I am not a professional and I don't know the specific details of this situation but this is the best answer I can give with the little amount of info there is :/