Per the Marriage Bond information for her marriage to Michael W. Scott on November 21, 1818, it was noted that Nancy was the daughter of Jane Adams. This calls into question Nancy's correct name. Was her maiden name really Adams and she had married a Purtle prior to her marriage to Michael W. Scott? Or, was she really a Purtle and her mother had remarried to an Adams prior to 1818?
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=muckham&id=I5642