speaking as a natural therapist - if your DD is a teen/in puberty, (the growing stage) 1000mg magnesium/day may well help, plus vitamin C and Zinc, magnesium is a muscle relaxant and long bones in the legs grow faster than muscles can keep up. heat packs are brilliant for pain relief, mum you are doing the exactly right thing! empathy and "mothering" are what teens thrive on despite what they tell you lol