Looking for Nancy Hall Witherell

I am trying to find information for Nancy H. Witherell who married Enos Cleveland on September 14, 1850. One of their children was Sarah Cleveland Dreyspring. According to Sarah's obit, she was a descendant of the Witherell family, one of the founding families of the American Colonies who settled in Massachusetts in 1634.

I am looking for Nancy's parents, her DOB and Date of Death so that I may trace her back to the above-mentioned Witherell's. Thanks.