Hannah Gilderdale

The spelling of Hannah's name as Guilderdale in the marriage certificate is the main clue to this being the Thorne Hannah who marries here. It is only really John's family that use this spelling. Nevertheless this Hannah is only 15, so would almost have to be pregnant. Another possibliity would be Samuel's wife Hannah, if he had died shortly after their 1771 marriage, however the spelling clinches it for me.