PigtailSam having a protection about unwanted pregnancy is a better solution. Having specific solutions tailored for a adhd (I’m not an expert here) are a solution
A chastity belt is not. And let’s talk about the best scenario. She submit, complete her studies, and then? You keep her belted all her life? You free her and she will probably have a lot of sex, having lost any control?
Let’s suppose nothing happens, when she will build her life, someone, a boyfriend, an husband, friend, will point out she has been abused, what kind of relationship will you have?
And this is the best scenario: other possibilities are that she tell your friends that her mother forced her into a chastity belt. Can you imagine the scandal
Or what if she goes to a teacher? Or to the police. They will have to open the belt
What if she plainly sue you for abuses? You will probably have to pay a great sum of money.
And in all this cases your relationship will be devastated. Are you ok in losing your daughter?