This is why:
... Indeed, besides Jahi's mother's claims, it is alleged that Children's Hospital is unwilling to allow an outside doctor to fit the 13-year-old with the breathing and feeding tubes that would allow her to be safely transferred to another facility, its lawyer said Tuesday.
Children's Hospital Oakland will not permit the procedures to be performed on its premises because Jahi McMath is legally dead in the view of doctors who have examined her, lawyer Douglas Straus wrote in a letter to the girl's family.
'Performing medical procedures on the body of a deceased human being is simply not something Children's Hospital can do or ask its staff to assist in doing,' he said....
The skeptic is never for real. There he stands, cocktail in hand, left arm draped languorously on one end of the mantelpiece, telling you that he can't be sure of anything, not even of his own existence. I'll give you my secret method of demolishing universal skepticism in four words. Whisper to him: "Your fly is open." If he thinks knowledge is so all-fired impossible, why does he always look? — James Sire (from, The Universe Next Door)