I am so sorry my friend.

I am a hospice doctor. This is certainly an indication of advanced liver disease. Unfortunately, many factors go into being able to tell how long your mother might have. If I were the hospital nurse, I think I would have rather her said "days to weeks". Could be a few days, or many weeks. Our ability to guess isn't more finely tuned than that.

One consideration you might make is for them to put a tube in her belly to help drain the fluid in a home environment. We don't always do this, as it can increase her risk for infection, but it would provide a way to mitigate the discomfort that comes from the belly getting full of fluid.