Careful, Derek, you are in danger of clutching at straws.
From the evidence we know she wasn't born in Durham, both censuses give a DOB about 1891 (although of course the 1841 is rounded) and according to the 1851 she was born in Lunesdale. From her marriage and the children's baptism we know she was probably Elizabeth rather than Betty. Have you got her death, or is she in the 1861 census?