Not without help at the level of basic functions at staying alive. If the constant help stopped, she would die.
I'd say, using your assumptions, that if she wanted to live, she would be able to without help. 
Don't you think the fact that Terri is still alive is a statement from her that she wants to live?
You have not adequately responded to that question.
Not without help at the level of basic functions at staying alive. If the constant help stopped, she would die.
I'd say, using your assumptions, that if she wanted to live, she would be able to without help.