@Robert Gentel,
These things are always kind of cute as philosophical questions, and it's really easy to be critical.
However, can you imagine actually holding down a thirteen year old, forcing a needle into her veins, cutting her body open against her will, and then forcing her to take all the drugs and forcing drips into her and the whole medical shebang that goes with such major surgery? Maybe for years? If she survived the surgery, rejection, infections etc.
I am wondering if there is not a whole backstory that goes with this, as I truly cannot imagine a hospital here going to court to try to force such a measure upon this girl and her parents.
It is certainly a difficult dilemma, but, given the girl was assessed, and the child protection folk deemed her decision to be acceptable, then I certainly wouldn't be wanting to force her to undergo major surgery with life-long medical difficulties ensuing without her consent.