Some one a bit cleverer than me could answer that It could be like a marriage bond,she could have been an apprentice any thing ,
there are three births that you could look at ,
1, Isabel Hartley ,23rd June 1765 ,Gateshead daughter of William Hartley,
2, Isabel Hartley ,20th July 1872, Berwick upon Tweed , daughter of Benjamin and Jane Hartley,
omit number 2 ,she died 1879 ,
3, Isabel Artley ,27th December 1872 ,Chester Lee Street,daughter of Walter and Eleanor Artley