It seems to me that when one of the girls hears a command for one of the other girls, they act like the command "It's ok. Enjoy it and help it alone." was given to them. To me then I interpret a command to violet effecting Hannah too. That seems pretty consistent though out the series.
I guess. It'd be fun if that was addressed. Charlotte from By the Book was one of the few characters who was aware of her male partner's mind control and was cool with it, but it seems that's being canceled at this point.