I’m in general agreement with you.
Except quite importantly you are being dishonest by calling her a corpse.
Until she is removed from the life support and dies she is not dead.
That’s the whole issue.
Disagree. AFAIK, in every state the legal definition of dead is brain death.
She has been pronounced brain dead by 3 separate and (hopefully) competent physicians.
Brain death was originally put in place for the very reason that it is possible, in many cases, to keep a heart beating long after the brain has died. To which most people agree there is no point.