Welcome sunshinenys,
I am so sorry you have to deal with this again, once took so much out of me and my family, I couldnt imagine doing it again, however if I ever do I know now I would let my loved one make the decision..
We had many family meetings with my beloved dad trying to convince him to try some sort of treatment after the surgery because we thought that was his only option..He never wanted to go through with any of it, I know he did it for us, through all of our tears he gave in and it ultimately led to his death..He was doing so good after the surgery..Once he started radiation, he started to decline, so I live with the guilt every day, knowing I talked him into it..So you may want to leave the decision up to your mom as long as she is making an informed decision..
I dont want to scare anyone away from treatment because it does work, and everyone responds to it differently..I know its so hard being where you are right now, try to support what ever your mom decides, dont second guess like I did..