No matter what, you have to get medical treatment for your mother.
Hep C can and will seriously damage her liver. The symptoms you describe could be related to liver disease. Only a thorough exam, including blood tests can tell for sure.
I also, strongly, recommend that you insist on seeing the results of the biopsy and, if necessary, change doctors. Is there a liver treatment center in your area?
I wish you luck. It sounds like you've got a lot of work ahead of you.