You didn't read all the way.
Yes I did.
"I always wanted her to live, but what is living?"
That is not for you or I to decide. People who want to make sure they don't live, unless they have all their faculties, can make living wills, stating, that they don't want to be kept alive by artificial means.
But other people may want to live, no matter what.
Terri has loving parents who want to take care of her. That makes a big difference.