My fiance started walking for two days now she complaining of pain under her knee cap above the shin it hurts when she applies pressure and squats.?

Stretching: It sounds like she is stretching some areas that are not used to it. Try applying ice and doung some stretching which should help.

Tendinitis: If the pain is directly below the knee cap, it is patellar tendinitis. Would stretch, ice, and use anti-inflammatories. Start off walking short distance, and gradually increase. Make sure she has good sneakers.