Absolute prayers for God's will to be done as requested and that whatever lies ahead, that peace, strength and God's hand on your mom throughout whatever time He grants.
My uncle, Dad's brother, died of bone cancer. On his last trip North, he took me aside to tell me "it's back". When he professed he'd be healed, I countered in my 20's with, "What happens to your faith if you're NOT healed Uncle Bob?"
He smiled and put his arm around me and quietly said, looking me square in the eyes..."Son, even death is God's PERFECT healing and I get to be rid of this shell and walk with Jesus!"
Someday, I hope to have that perspective and peace. May your Mom squeeze out every drop left for her and enjoy it immensely...and when God is ready for her, may she and all of you have the same perspective as my uncle.
Keep the Son in your eyes!