Birth: 1761 Farnham, Surrey, UK
Father: Samuel Croucher 1718-a1761
Mother: Olive Budd 1731-a1761
Christening: 15 May 1761 Farnham, Surrey, UK
Marriage: 21 February 1786 Farnham, Surrey, UK
Huband: John Blanchard 1749-1801
Death: January 1821 Farnham, Surrey, UK
Buried: 26 January 1821 Farnham, Surrey, UK
Entry in the IGI for the christening of Sarah Croutcher on 15 May 1761 in Farnham, father Saml Croutcher. If I have the correct parents this implies Samuel and Olive had moved to Farnham.
Entry in the IGI for the marriage of Sarah Croucher and John Blanchard on 21 February 1786 in Farnham. There is also an entry in West Surrey Family History Society West Surrey marriages with the same information adding both were of this parish.
There is an entry in West Surrey Family History Society West Surrey burials for Sarah Blanchard on 26 January 1821 in Farnham, but it gives her age as 80 instead of 60. However I cannot find a reference to any other Sarah in the area.