Hi,
On the 1851 census it says Sarah was born in 1802 in Edmonton, Middx. On findmypast there is a baptism for a Sarah Warren 10/6/1802 -Father John who was a Waterman, and Mother Sarah. She was 11 days old when she was baptised, so born 30 th May 1802. Baptism was at St Dunstan in Stepney High Street.
regards.