I feel for you op my OG mom died from cancer when I was like 10 I distanced myself mentally, and didn't really understand the situation too much. On your situation it's her time to pass on to the next life. I'd be appreciative of the time you have to achieve closer. Time to speak your last words, and actions as afterwards your only left with her memories, and spirit.
Praying for gods blessings on your mom and that her suffering and pain is taken away! Praying also for you and family that Gods love will help you through this !
As she reaches toward Heaven, longing to be with her new healthy body, I pray for you strength to help lift her up as she goes on to a much better place.