Ann Gravatt
born April 1818–April 1819
  in South Biddick, Co. Durham
died very roughly 1888

1851 census: living in Lumley Thicks with husband and children. Age is 31 and place of birth is South Biddick, Co. Durham. (South Biddick was north of Burnmoor and west of Penshaw).

1871 census: widow and head of household, living at 3 Cherry Hall. Age is 52 and place of birth is Chester-le-Street.

It's possible that her maiden name is Watchman, not Gravatt—further investigation required!