This must be so hard on all of you. For your mother, she must be scared, both of the disease and of the chemo. After all she went through, her decision is understandable, but hard for the people who love her to accept.

May I ask, did the doctor say what effect the chemo would have on the cancer? What is the survival estimate if she goes through it as opposed to not? Sometimes chemo only gives a person a few more months, sometimes years, sometimes they expect full remission. Have you sat down as a family with her doctor and discussed all the options and what benefits each of them have?

Ultimately, this is her decision, but that doesn't mean you can't talk to her about it. Just make sure to remain calm and understanding. Don't make her feel guilty or like you are attacking her. Put yourself in her place as best you can to understand what she is going through.

Regardless of her decision, make sure she knows how much she is loved, no matter what.

I wish you, your mother, and your family all the best.