Thanks to all of you who have expressed sympathy or good wishes. Carol's Aunt Dorris did have a Living Will, and so once it was determined that she was essentially "gone," the life support measures were removed.
As of this writing we've not yet received word that her body has expired, but it will be very soon. Both Carol and her mom are in agreement that, given Dorris' declining quality of life, this was not a bad way to go. And both are glad that the living will was in place, removing any doubt as to her wishes concerning the life support.
Pulling the plug would always be difficult if those wishes were not not known; much less so in these circumstances.
Death is an inevitable part of life. Best we all prepare for it.