JoAnn,
Lupus is not hereditary but there is a tendency for auto immune diseases to run in families. We inherit a set of genes that predisposes our immune system to disruption. IF something triggers a response we get a disease but not necessarily the same as our parents had.
Lupus can "lurk" in your body for years and you can be virtually asymptomatic. Lupus can hit anyone at almost any age even an old guy like me. I believe that my disease was lurking for at least 15 years...I had low platelets and mild anemia but NO other symptoms until 3 years ago. Some researchers believe that an initial trigger starts the disease but you can be asymptomatic for years until another trigger pushes your immune system over the brink. Lupus is not like a disease with a specific cause and treatment. Same for other AI diseases.
It is possible that lupus caused you mothers liver problems but she might have another cause for it.
It sounds like your mother is in diagnosis hell which so many of us have experienced the same thing. It is important to find a rheumy who is really experienced treating lupus and coordinate with your other specialists.
AS for fatigue, that is a hallmark symptom of lupus and other AI diseases. There is no pill to cure that...and probably no supplements to make it go away. When the disease is controlled usually fatigue is less of a problem.
Sorry you have these problems.
Bill