I understand that her “want” is better than drugs etc and a loftier “want”. But it’s still a selfindulgent want. At 16 is she even thinking of death? REALLY cognizant of the consequences? Most kids think they’re bullet proof.
Its not as though brains and guts will be enough to survive on.
And she is a minor. Parents are supposed to protect their kids from ill advised choices, not facilitate them.