My daughter's doctor noticed a slight curvature of the spine during a routine physical last year and tracked it with regular 6 mth x-rays for a year to see if it was getting worse. It didn't. She suffers no back pain, it certainly doesn't stop her from playing tennis and soccer, running, jumping and tackling other soccer players.
Your daughter will probably also be fine. At a recent visit, another doctor told me that sticking kids in chest braces for scoliosis was a thing of the past, unless the degree of curvature is severe and I think that is unlikely in your DD's case, because if she had a severe curvature, well, you'd have been alerted about it before now, right!
I remember being upset and anxious last year when my doctor mentioned "scoliosis" in connection with my daughter and I tormented myself looking up nasty images of acute spinal curvature online. God, I do not advise it, although it does have the positive side that it will reassure you that your daughter has nothing like that!
Clare