Are you working on stability in the hip?
Lateral leg raises
Medial leg raises
bent leg lateral raises
single leg tuck
single leg over hold 20ish sec
Have you addressed tissue up/down stream of where you see the issue?

Go back to stage one and retool the movement pattern.
The movement pattern is not correct. Correct the technique deviations.
Squat therapy, box squats start as high as she needs to maintain correct movement pattern. Lower the box as the technique holds.

The homework may be too difficult for her to perform on her own.