Our expert says:
She may have Osgood Slatter syndrome - in their growing period, the tendon may pull sligthly loose from the knee cap and can cause inflammation - see http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Osgood_Schlatter_syndrome
Ask your doctor to have a look as she will have to rest from the modern dancing for a while if this is the case
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