Mary Ann Thrall 1829 CT

Hello all! I am hoping someone might be able to help me with one of my "brick walls"! I am trying to find info on my great great great grandmother Mary Ann Thrall. She was born Sept 17 1829 in Fairfield CT - or so that is what I have seen thus far. At some point she moved to the Omro Wisconsin area and married Cyril David Minckler (Minkler) approx 1848. Two sons: William David 1851 and my GG grandfather Birdsey Dwight 1849.

I have no clue who her parents were ... it's driving me up the wall. Any help would be wonderful.

Thank you