openshut, welcome to the forum. Unfortunately, you picked up an older post. Sometimes people can "fall through the cracks" that way and their post not be seen. Better to start a new topic and introduce yourself and your situation.
At any rate, I'm sorry that your mother has ESLD. The only vaccinations that are available for hepatitis are for hep A and B. Hep C has treatment after one is diagnosed, but no vaccine as yet. There were no tests specifically for hep C prior to 1992. I do, however, think there were vaccines against B prior to that, though not sure if prior to '90 or not.
I suggest you read through some of the older posts. You will find answers to your questions, I'm sure.
Is your mom under the care of a hepatologist? Is she taking diuretics for the fluid? Liver disease is different in everyone, so no one can really predict how long your mom will live without treatment. The disease can be managed, to some extent, through proper diet--particularly no red meat and lots of fresh fruits and vegetables--and of course, no alcohol.
I'm sure you will receive lots of support here, as well as information.