@jespi
I'm so sorry that your mom has not found any help for this pain. Perhaps this would be a good time to get a second opinion. It is always appropriate for a patient to seek a second opinion when they have a persistent issue that their current medical team can't address.

Do you know of a multi-disciplinary medical center that you can contact for a consultation? Mayo Clinic would be a good place to consider (appointment information http://mayocl.in/1mtmR63). If an appointment at Mayo is not possible, a consultation with a university medical school might be appropriate.

Have you considered getting a second opinion?