“You can’t have obedience without consent.”
That is not actually accurate.
I think you might mean “You can’t have obedience without compliance.”
Because an awful lot of people have been made to obey and submit, and made to do something, but in their minds they were rebelling and hating and opposing whatever they were being made to do. Consent wasn’t in the picture, compliance was.
With Mary it was consent. You can see this in how Gabriel had to explain HOW she would become pregnant.