Fae's cannot cross certain boundaries, for example telling a lie. They have some wiggle room so they can workaround their limitations, but that's not free will, they're very strict on tit for tat rules, duties, boundaries, and relationship protocols such as hospitality, keeping promises & anything related to balance.
So the question is: what about the Queen telling her knight to betray his other mantle rights & duties if she desires, such as giving her Blackstaff that Warden of Demonreach has confiscated? I think not, Harry being a WK is separate from Warden thus it's not possible to get him to betray his Warden's right from Fae perspective. She could offer him something for it, but command him: no.