"Advanced Directive - if you don't have one you better get one"
No, but if you do, make it ONLY a limited one...
--DON'T say you dont' want extraordinary efforts put in, because then they really don't, cannot, try as hard.
--DON'T put in writing that you allow the doctors to make the decisions should there be no family around, because your relative could be 10 minutes away, and the docs could make the wrong choice.
--DON'T say that you don't want to be on artificial respirators entirely, because what if you're on a few days, recover and can be off?
--DON'T say it's okay to do something to you which God forbids, causing them to be guilty of murder and yourself of self-murder.
What CAN you say? "Yes I have an Advanced Directive", "Yes I want all possible means to keep me alive",(this doesn't mean you have to stick with this later. Then have determined several possible guardians to be contacted. You are not making an arrangement with the Medical Profession. They only want to know Yes take care of me" or No.
THEN make your agreement with your friends/family/guardians as to how to decide. Ask that they evaluate amongst themselves your case. Give them the freedom to change to someone else if needed.
Value your life. Let God take you when He wants. He'll use means, such as the wisdom of your guardians to help you be pain free if needed, to not bankrupt your entire family, but He does it ethically. As much as death can be ethical.
As her guardian - Michael ordered the feeding tube because it was costing too much money to have staff take the time to feed her.