My mother passed away from acute myeloid leukemia. Once she quit the blood transfusions, she passed fairly quickly, I would say within weeks. This was 11 years ago, so my memory may be a bit off. We had the help of hospice & I stayed with her. She was 80 years old. She just seemed to get weaker and she did have some headaches. She was given morphine and another pain medication and an anti-nausea medication. In the end she went into a coma for about a day and passed peacefully.

I wish you God's guidance on this... May he ease her discomfort at leaving, your pain at losing, and may He welcome her to His kingdom when the time is right.