Chiropractors take 4 years of neurology and very often figure out what's going on with the anatomy and it's physiology extremely fast.
My dad has been adjusted since he was 2 years old. I've been adjusted since I was 2 days old, as I was a vaginal breech birth....and been adjusted through my athletic teen years, 4 pregnancies and during 3 of the labors. My kids have all been adjusted from birth, ages 9, 5, 3, and 9 months. We go when we feel like it. Our DC doesn't put us on a program. I go more often than the kids and hubby does, but our DC has figured out and fixed so many things that have left our MDs scratching their heads.
NOT ALL CHIROS ARE CREATED EQUAL, so find one you (she) likes. I've been to some great DCs and some not so great DCs, so maybe check out: http://icpa4kids.org/Find-a-Chiropractor/ to start and see how it goes. If she's not getting results within the first few adjustments, maybe find another one?
Our neighbor's daughter goes to our DC probably every 4-6 weeks, but she runs track and cross country, so she also goes in immediately after injuries and gets her ankles, knees, feet, back, etc adjusted. She's been consistently in 1-2nd place since she's been getting adjusted.
Also a good calmag is important for the muscles, so that they stop pulling the bones out of place, which are not far enough to be seen as a dislocation on an x-ray, but can cause some good pain. Stay away from oyster shell calcium and calcium carbonate. Calcium is best taken at night, as it is a natural nervous system/muscle relaxant.