Just wondering... As an adult, I once signed myself out against medical advice. Why can't the parents do the same for their minor children?
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Because they would have to take her off the ventilator, IV's and feeding tubes, and would probably have to take the guerney, too, as she has no muscle tone at all. They can't just hook the ventilator up to a battery and put it in the back of a car. The family would also likely severely damage all legal claims against the hospital if they did this. I doubt they would even get out of the hospital without her respirations ceasing and heart stopping.
I'm sure Children's Hospital wouldn't mind if she just vanished, but they do have legal responsibilities and would want to be circumspect and decent about this.