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Just to set some dates (you didn't mention any!

):
Marriage: December qtr 1882
Barnstaple district vol 5b, page 907
Townsend, Harry
+ and on the same page +
Westacott, Jane
And, to confirm, the 1891 census:
Class: RG12; Piece: 1774; Folio: 113; Page: 17
Cyprus Terrace, Newport, Barnstaple, Devon
Townsend, Harry Head M 29 Groom b Christow, Devon
Townsend, Jane Wife F 30 b Swimbridge
Townsend, George H Son M 8 Scholar b Swimbridge
Townsend, Redvers H Son M 6 Scholar b Barnstaple
So, now we have an approx. year of birth for Jane! 1860
1861 census: Class: RG09; Piece: 1488; Folio: 9; Page: 12
Forest Cottage, Swimbridge, Devon
Westacott, George Head M 36 Carpenter b Swimbridge
Westacott, Kezia Wife F 29 b South Molton
Westacott, Mary A Daughter F 5 b Swimbridge
Westacott, Thomas Son M 3 b Swimbridge
Westacott, Jane Daughter F 1 b Swimbridge
+ servant and 2 apprentices
And a birth:
December qtr 1859
Barnstaple district vol 5b, page 469
Westacott, Jane