MCL Issue

One of my athletes had a bad fall over a hurdle in a race in March. She landed solidly on her knees. Initially the pain was all in the bruising and she had limited mobility as the wounds were quite big. She slowly returned to training and competed a few times after the fall. She now suffer from irritation in knee in what looks like the Medial Collateral Ligament. She has no pain but it get sore when she does drills and runs.

Does anyone have any ideas for me on what it could be?