Even living at home with parents, even if parents choose to fully support her, as an adult she makes her OWN choices.
Parents can choose to kick her out. But they can't FORCE the adult to live by their rules. Either they live with it, or they kick them out.
But it is still the ADULTS choice.
I DO agree, if she lives with her parents, she SHOULD follow their rules. But if she doesn't, they can't FORCE it. Either they put up with it, or kick her out.