She needs to build up her thigh muscles esp the quads because they hold the
knee in place & keep it from grinding so much. So standing poses are
important. Try to have her bend less, get more arch in feet, be sure knee is
not going past ankle, activate & lift up on thigh like she was pulling knee
to belly. Workonthat in tadasana too. Check to see if she hyperextends knee
also in Tadasana & Triangle.