Have you spoken to the rheumatologist about
the fluid retention? Liver function tests can fluctuate. Again, it may just be the Lupus doing it. Did you bring up the possibility of having some antibody tests specific for AIH or PBC done? One doesn't always test positive for antibodies for AIH (there's anti SMA, LKM-1, anti SLA). AMA can be used for both but is much more common in PBC. A liver biopsy is the best diagnostic tool though.
Have you gotten your lab tests back for blood levels yet?
I think it's more than likely your Lupus since that affects so much but best to speak to your docs about your concerns.