Hello My Mother Has Been In The Hospital For A

Hello my mother has been in the hospital for a month. She went in with hypothermia and went into a coma. She was in intensive care for a week with ventilator then I found out that she had several strokes dr said it was best to take her off vent she has been in coma for a month with no food or water they said she is dying I want her to go peacefully but she is hanging around how long can she make it