The heels would stay because of the ankle straps. The brown „heel cuffs“ are locked so she can’t take them off if she wanted to. I‘d love that for myself too to be honest.I don’t know, but since her shoes seem to have a black cuff above her ankle I don't think her heels would come off. I would guess it would hold her heels on if needed but mostly tie her ankles together.
Someone should make heels with locking cuffs and rings to tie you down - imagine wearing those all evening on a date and everyone seeing them.