Bring her to the basement to face her fear of confined spaces. Confront her with the head box and reduce her to tears while locking the cruel device firmly around her submissive throat.
Test her resolve with a whip and a vibe, making her come while locked away in the dark box. Stuff a hard dong through the mouth hole to reward her for making it through, then release her and order her to spread her creamy, long legs and get herself off while talking impure to the camera. Making a thrall wear delicate and unusual clothing is one way of exercising control over ‘em. It can dishonour ‘em and place ‘em even further under the control of their master or dominatress. But the ultimate submission is accepting the collar coz that marks the thrall as the property of the one who has attached it. Tie her in an uncomfortable position and and impale her mouth and her slit silly, teasing her to orgasm. Reward her trials by ordering her to beg for the cattle prod while her cunt is full of hard dong. Train her to maintain her composure when hit with the prod in preparation for her last day with Princess Donna.