I agree that the hot water bottle helps, you could also think about a hot bath and breathing/ relaxation exercises... playing sports/ some kind of exercise actually helps too even though many people don't particularly feel up to it when they're in pain.... warmth helps the most though, it relaxes the nerves or something..... if the cramps becomes too uncomfortable though I would take her to the doctor who would be best able to advise you on which meds to take... ie. which OTC meds. the point is, most people can find SOMETHING to ease their pain, a good point for your daughter to understand.