I personally find some of the comments on this thread to be quite unkind to a woman in the process of losing her child. If it were me, I have a boy the same age, and I would have to go down every avenue to fight on his behalf just so "what if?" thoughts didn't haunt me for the rest of my life.
She's probably already feeling an enormous amount of guilt that he's in this situation - not that it's her fault at all - on top of the denial. It's all she can do now for him to fight his corner for any tiny chance 'just in case', because once it's done it's done, and can't be undone.
It's really sad that a child in Archie's situation is thought of as a "bed-blocker" wasting NHS resources.
I wouldn't wish it on my worst enemy what that family are going through.