Actually I would say it is a decision your daughter should be making since it is her body. Birth control really does help lessen flow and hence cramping and it also helps to regulate the menstruation cycle better.

Sure that is true.  I know they do that with kids these days.  My daughter had really bad cramps too and they said that was the next option.  I would trust your wife and let your daughter go on some kind of birth control.  They say it even helps with acne.