Welcome to the forums, Alberto. Before you order the belt, consider what would happen if she is caught wearing a chastity belt outside your home. I'm not saying it's great for her to say she wanted to wear it, but make sure she has clothing that doesn't shift and expose her steel waistband.
I believe James is trying to ask you to tell her about this forum as there are plenty of women, few even her age, that has experience, advice, and tips during the times she wears the belt and it would benefit her the most to learn from them by getting notifications of their responses. Also, another good point where school has a chance of her trying something forbidden against your wishes, like getting together with a boy.
I'm not saying you should get the belt, but both of you need to discuss clearly how often you'd let her free/clean herself, and when she'll be allowed to take off for good. Hope she doesn't get drunk and something happens to her again, though. Good thing she was fine this time, but please do your best to take care of her.