It taes a long time to recover from the surgery and I can imagine it gets even harder the older you get. All of those muscles are cut. Is there a problem giving her the meds? I would talk to her dr. and try to find a combo that helps her with the pain. I was still having pain two months after my surgery. Good luck to you and your mom.
Yes. Most likely she has pain from scar tissue. But as I've answered before to you, it could be anything. You should ask her doctor if the pain is not controlled by the meds she is taking now.
Teresa