You're probably right ... I have my doubts about a few people :-), but maybe it's just differing communication styles ...
The question then, given that she's unlikely to recover the abilities you and I have, is (1) whether you consider a life at diminished capacity worth living, and (2) whether you believe a person should be deprived *by others* of a life *they* don't find adequate.
As I said in another post, it's possible that with therapy she may communicate clearly, which would greatly alter the issue. Do you kill an innocent person who has expressed a desire to live, simply because she is handicapped and likely to remain so?