Spinal scoliosis is usually treated with some sort of surgery on spine and usually it is about spinal fusion. My dad had the same surgery for the same reason and I know that this sort of surgery on spine consists of fusion that is connecting the spinal vertebras, in which manner the spinal flexibility is decreased but also the curve as well as the pain are being eliminated. In fact the spinal flexibility doesn't have to be that much limited if the small pieces of some connecting bone is used and usually another incision needs to be made for the fusion bone usually originates from the patient itself and usually it is small part of the hip or pelvic bone, but also in some cases the fusion may also be performed using bank bones. Anyway possible spinal fusion complications are bleeding and infection as well as urinary problems though this is very rare. Your mom should feel some pain few days after the spinal surgery and she could expect also to have some inner or outer immobilization also in order of fusion progress and in some cases both sorts of immobilization are needed.