The truth is, that you need a system to first assess which muscles you need to release, stretch, and then strengthen. It really be could any number possibilities ranging from her feet flattening which rotates her tibia and femur to an excessive curve in her t-spine forcing her lumbar region to lock together in efforts to keep her spine erect.
The key is to assess her first and see what she needs, can do, and tolerate.
Once you can determine which region (or regions) show structural deviations then you will typically follow a pattern like this for treatment of muscular skeletal structure issues.
1. Epsom Salt Bath
3. SMR (foam rolling)
4. Stretching (static to dynamic)
Hope this helps,