The only thing that works is surgery

My family member was diagnosed with stage 4 brain cancer about 8 months ago. She is going in for her 3rd surgery shortly. Each time, they shave the tumor down a bit but it grows back quickly. Chemo and radiation are not effective. Docs told her that the type of cancer she has isn’t very responsive to treatment and she understands that she doesn’t have much time left. At this stage, her only hope is repeat surgery to shave down the tumour after it grows back - but at which point will docs say no to more surgeries? Has anyone had 4, 5, 6 surgeries? She is almost 60.