It sounds good getting a second opinion.
I hope your mom can live a good low pain life for a while so you can renew your relationship with her.
Some people do well with illness.
I have a great Aunt who is a bit older than my mom and she has bone cancer that has spread to other area's she is dying but she is so sweet and happy. I have talked to her a couple of times on the phone and she is so nice and still giggles.
You being in your moms life now that you are getting along good will help her also being positive helps sick people and she won't have the guilt of not having a good relationship with you to worry over.
I heard it said Love heals.
Jeanie