Vanessa Can't she try for a set duration,and then decide if she would still wear it or not,as it is willingly,in your family?
Yes, of course she could do it... But she is so much pride or stubborn.
It is a complex situation, it includes a lot of reasons, firstly she is, or she pretend be, very independent and she is afraid that a belt avoids it.
Another reason, I think, she was a bit curvy, and nowadays she is much more slim, I believe she was afraid of be uncomfortable in the belt (she would be right in this), and for that reason she rejected the belt.
It is curious that, I wrote it here a couple of years ago, while she was a bit fat, she asked for a corset, and nowadays she does not touch the topic...
In her rejection is important the fact that she... well, she touch herself in places where she should not. It is forbidden, but I know she does it.
And finally, I think, she rejected it so many times, and she made fun of us so many times that it would be very hard for her accept the chastity belt.