What is the life expectancy of someone with heart failure?

I recently found out that my grandmother has congestive heart failure. She is only 62 years old and has had a series of kidney, heart, and gall bladder problems. She is very short of breath, can’t eat much, and is having problems doing very basic things. The doctor told her that the life expectancy isn’t very long for her. How long would you say it would be until her time comes?

As some background, her family has always had huge medical problems. She has lived longer than anyone in the rest of her family. She has been at the brink of death numerous times, but been saved by the skin of her teeth.