May I suggest Scoliosis SOS? Where do you live? There's a clinic in Bristol and one in London and I think maybe another one or two in other areas of the country.
They're a bunch of therapists not dissimilar to physiotherapists who specialise in a special type of therapy called scolio-therapy. They can assess your daughter using a scoliometer and scan to give you some idea of what is going on with her spine. She will be given specific exercises to do to help decrease and stabilise any curve that may be developing.
My seven year old daughter, who has a very tiny positional curve (they called it pre-scoliosis) and some issues with poor posture, has been attending since around August last year. Her condition is very mild obviously, but her spine is now almost completely straight, and as long as we keep up with her exercises as she grows, she should (fingers crossed) not develop scoliosis.
The change in her body has been rapid and incredible. They help all sorts of people - children, adults, people with huge, severe curves and those with mild issues, like my little girl. They also deal with postural problems as well as scoliotic spines and are truly amazing.
Please check it out. It's pricey but totally worth it.