curious If she projected her needs on you, that would suggest she should actually be kept under a far stricter regime and not be allowed any self pleasure, just the same as she treated you before.
@Christine might not want to openly discuss masturbation with her mom.
However, @Christine, you could mention that she made sure you were never alone without the belt, and ask if that's something that she feels she needs.
If she says no, say "Ok. Let me know if you ever change your mind." All rule changes need to be consensual.
If she says yes, maybe she feels shameful or dirty about masturbating and she would feel better about herself if she were stopped. How she feels depends on her morality, not yours. As her key holder, you're the only person in the world who can help her if she needs this.
