By accident I found a Sophia Hasselbacher who immigrated to New York in 1864.  I know nothing more about her.  It is almost certain she came from Vestenbergsgreuth, but that is subject to errors of spelling and my interpretation.  However, this village is not far from my usual haunts in Germany and I will pay a visit.  A Hasselbacher family there in the mid to late 1800s might have left some traces.