This is probably due to what is called Jumper Knee or tendonitis of the patellar tendon, the tendon that keeps the knee in place and attaches to the tibia. She should ice her knee after she used it for physical activity for 20 minutes and she should do some strengthening exercises before to strengthen her quads for better shock absorption. Her running and landing technique could be improper, so having a professional take a look at her form may be beneficial.
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