Just go gently, persistently and slowly, and only stop if it feels wrong. You might have to start, then stop for awhile, then start again over periods of time, just keep going as long as it feels right.
Don't try to force progress, just let it come. Don't worry about how long it takes, just get started.
COMPETENT Massage will help as well.
Louis Kuhne's Friction Sitz Bath will also help, and according to Dr. Kuhne, he has gotten rid of Scoliosis many times with it. The book has pictures which I am sure you will find inspiring and fascinating. No your doctor won't know anything about Dr. Kuhne and won't believe it either sl don't bother asking, you'll have to look Dr. Kuhne up on the Web.
Yoga will help if she can get interested in it.
Go by what your daughter feels is helping her. Above all, don't force her to "work out" unless *she* wants to.