People should have the right to die if they're mentally competent to make that decision. There is usually a legal document required for a "do not revive" order. I don't know why there isn't one in this case, or whether or not one is even required in that state. The only question here should be what the woman wanted, not the morality or immorality of letting someone die. If I was left a vegetable by some accident, I'd want to die. No one else has the right to make that decision.