Thank you for your question. If she is having continuous symptoms, then it may most likely occur due to nerve irritation (neuralgia) , neuropathy or lack of blood supply. I would recommend that you consult with your doctor to evaluate above mentioned possibilities in details. Hope this helps.
Take her to a primary care doctor, or preferably a dermatologist if the skin appears to be red or rash like. I am not a doctor but that is what I would do.