1851 Census - Piece 1663, Folio 271 face
Introduction
Living Carisbrooke Street in the Parish of Carisbrooke on the Isle of Wight, the household of Ann Reeves ....
Transcript or Summary
Rel Cond Age Occupation Where Born
Ann Reeves Head Wid 65 Straw Plait Manufacturer
Westgrimstead, Sussex
Alfred Reeves Son Unm 25 Master Butcher Carisbrooke, Hants
Charlotte Merwood Visitor Mar 40 Laundress Calbourne, Hants
Ann's place of birth is more likely to be West Grinstead in Sussex. Accepting the county to be correct, it is understandable the enumerator, familiar with local place names, might confuse West Grinstead with West Grimstead in Wiltshire
Source
1851 Census - HO107, Piece 1663, Folio 271 face, Page 4