Thanks Margaret and Beds. Boy,
This is my research on Sarah.
According to her, she was born in Buckden. She married Robert Cook in St Neots in 1809. They had various children: John, Ann, Thomas, Susannah (all born at St Neots) and Sarah born 1820 at Caxton. Robert was dead by 1841 and Sarah lived for a while in Royston with her married daughter Susannah before returning to Caxton with her youngest daughter, Sarah who I think eventually married. At first she lived with some of her children and their families in a place called 'The Warren' in Caxton. But as the years passed she ended up on her own.
Poor and with little in the way of skills Sarah lived at a cottage in High Street, Caxton for many years on parochial relief before dying in 1878 at the Union Workhouse in Caxton, aged about ninety - although her death certificate states ninety-four.
I have her death certificate but not her burial record

as I didn't have time to look at Caxton records for Cook. I'm fairly certain she was buried in the Parish Churchyard and I am thinking that perhaps her husband died in Caxton as well. This is something for me to investigate.
Bye for now,
Kirk