I am very sorry about your sister. I am happy that your sister got to know her granddaughter and her granddaughter got to know her.
"Never not even once did my sister complain, nor bemoan her fate."
My Mom had ovarian cancer, survived it...only to get esophageal cancer 5 years later, in her 60's. Like your sister, my Mom never complained. And my Mom taught me, like your sister taught you, how to live and love life. My Mom had faith and her family to help her through. My Mom had a feeding tube for the last 6 months of her life. We would never, never have suggested to remove the feeding tube, my Mom had nourishment till the end of her life here on earth.
As far as I am concerned, there is no A or B answer
Take Care, Two-Bits
What these young-uns do not realize is that life is one big class of learning. Some good, some bad, some heartbreaking and some the most heartwarming highs you think you could ever experience. It is so easy when you are young to look down at those less fortunate than you and think, I would rather be dead than to be like that. It is also easy it seems for some to help/push their loves ones on to the hereafter. This is their choice and I am not in a position to judge nor would I but to deny us and our loves ones the opportunity to die a natural death just......
My sister for those two years was not only surrounded by deep love but she gave it also. God, I miss her so much but I take comfort in knowing that when she passed on she knew she was loved and we knew we were loved back. My sister was not helped into death. She died naturally, this was her wish.