Do Hermoine’s parents even have the right to withdraw her? Harry’s parents apparently do not have such a right:
Muggles had around the same legal standing as children or kittens: they were cute, so if you tortured them in public you could get arrested, but they weren’t people. Some reluctant provision had been made for recognizing the parents of Muggleborns as human in a limited sense, but Harry’s adoptive parents did not fall into that legal category (Chapter 26).
But Professor McGonagall had made other visits after her first trip, to “see how Miss Granger is doing”; and Roberta couldn’t help but think that if Hermione said her parents were being troublesome about her witching career, something would be done to fix them...
I’m not sure the Powers that Be at Hogwarts would allow her to be taken home by her parents...
Do Hermoine’s parents even have the right to withdraw her? Harry’s parents apparently do not have such a right:
This quote in particular makes that point...