Could you, please, explain what is SMA?
Your symptoms do sound like lupus. It often manifests with skin rash. Extreme fatigue is also very common.
With autoimmune hepatitis you should have some lab changes-elevated AST/ALT/ GGT, bilirubin. Did you have these done? Rash is not a symptom of hepatitis.
I am sure, Rheumatologist will help you to sort it out. You say that you read that high SMA (again, don't know what it is) is not present with lupus. But remember that in medicine, nothing is absolute. Doctors see exeptions from the rules very often. And diagnosis can take some time to make. It is good that you will see a specialist.
ASMA is anti smooth muscle antibody and is usually seen in autoimmune hepatitis. Rash can also be found in this form of hepatitis. Yes, hopefully, the Rheumatologist will be able to help.