Hi @LinSkin
Welcome to the forum. The surgeon will take your mums age and health into consideration before deciding on any treatment/surgery. The aim is to prolong life not shorten it so be assured the medical team will be doing all they can to achieve this.
Knowing you have cancer in your body is extremely stressful so take that into account when talking to the surgeon. I think my mental health took just as much if not more of a hit than my physical. Your mum has you to advocate and support her so that is a major plus.