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Amelia Sherratt m. Charles Barrett, 1 Jan 1861, at St Michael's, Christchurch.Source:PapersPast.
Amelia d. 1914, 72y. Source: BDM.
Charles, Farmer, Tai Tapu, died 1907, 77yrs. Source: PapersPast.Details and photo on Charles are also in the Cyclopaedia of NZ - Canterbury.
Further from PapersPast: Amelia Barrett d. 30 May 1914, at her residence, Lonsdale St. New Brighton, Christchurch.
Correction to your marriage listing- the surname is Barrett, not Barratt.