What Is The Life Expectancy In A Person With Cerebellum Stroke?

MY 82 YEAR OLD MOTHER HAD A MAJOR STROKE IN THE CEREBELLUM DOWN INTO THE BRAINSTEM 2.5 DAYS AGO. SHE IS NOW UNRESPONSIVE AND COMATOSE. SHE IS NOT BEING ADMINISTERED FLUIDS AS WE HAVE BEEN TOLD THIS IS NOT SURVIVABLE. SHE WAS WELL NOURISHED UNTIL THE STROKE AND FLUIDS WERE STOPPED 1 DAY AGO. HOW LONG WILL THIS DYING PROCESS TAKE? IT IS SO DIFFICULT TO WATCH AND WE WISH IT TO END FOR HER MORE THAN ANYTHING ELSE.