I have a degenerative disk in my L5/S1 (low back) caused by my first pregnancy. I saw about 4 different chiropractors that all tried to fix me in different ways, but the nature of my pain/injury was not discovered until my OB recommended a real MD. I had an MRI and discovered that I had inflammation in my tissue that had spread to the bone, which apparently can be extremely painful (you're telling me...). After getting an accurate diagnosis, I was able to effectively treat and overcome the pain. I will never be 100% and had to give some things up like snowboarding and helping friends move (oh, darn), but I am so much better off after knowing what was really going on with my back.
Even after this experience, I'm still a believer in chiropractic care. HOWEVER, there are a lot of homeopathic, naturopathic, chiropractic quacks out there that just want to take your money and their treatments do nothing at all or can actually do more harm than good. I found a few chiropractors that I trust impeccably and whenever my husband throws his back out, chiropractor is his first stop. And they work wonders every time. Just be sure to go to someone you trust. Ask your friends if they recommend anyone (facebook it or mamapedia it in your area). Good luck to your daughter! Hope she feels better soon!