My 15 Year Old Daughter Had A Injury About 8

My 15 year old daughter had a injury about 8 months ago that affected her back. An MRI showed no major damage but has had an affect on her being able to run and do most exercises. The pain starts in her lower right back and goes through her hip and down the front of her right leg. Any possible ideas on what may be causing the issue or some exercises to help build up the muscles and get past the injury? Thanks Randy