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First, the initial desirable end-point of the treatment of autoimmune hepatitis is normalisation of the liver function tests (meaning transaminases—ALT in this instance), hence most hepatologists would probably want to treat you unless there is some other issue in the background.
Second, I think you need other tests; if you are contemplating pregnancy (and this can be problematic for women with significant liver disease as they tend to be subfertile) it is important to exclude portal hypertension. While this would seem unlikely on the basis of what you have said, it is worth an ultrasound with portal vein Doppler. The point here is that pregnancy may exacerbate portal hypertension by increasing mesenteric blood flow, thus increasing your chance of bleeding from varices, if you had them.
Third, given the Sjogren's, I think it is worth testing to exclude other associated "autoimmune" disorders and this should include serology to reduce the likelihood of coeliac disease (that is associated with abnormal LFTs in a significant proportion of those affected) as well as primary biliary cirrhosis (that occasionally may be confused histologically with autoimmune hepatitis, but obviously has a different treatment and prognosis), and thyroid dysfunction.
I don't know of any good liver Docs in NYC personally, but I do know there are lots of truly excellent ones there. The American Liver Foundation or the AASLD may be able to help you.
Hope this helps,
Sonic