Laura,
I am sooo sorry to hear about your mom.
I am in a very similar situation with my mother, who is only 59! Her liver cancer is secondary, she also has secondary cancer on the spine and the brain. They haven't located the primary source yet. Today they are doing more tests so I hope this will be the day we find out!
My mother has not started treatment yet, in the midst of everything this last month she had a heart attack which postponed further tests and treatment.
She has been told she is terminal and the treatment they give will only control pain. We see her Onc on Friday to discuss all available options.
I would be curious to find out which treatment your mother is on and how she is doing.
Good luck!
Lisa