From Muriel Leo’s (nee Oliver, 1917-1998) Family Tree.
Date of marriage (3 Aug 1903) from Dax Eric Clayton Lloyd, (great-grandson of Jessie Bertha Oliver b.1876).
A further update from Dax of a newspaper clipping has the date of marriage as 3 September 1903 at the residence of the bride’s father.

The clipping reads, “BRADLEY-OLIVER. - On September 3, 1903, at the residence of the bride’s father, by the Rev. J. W. Hayward: Thomas Henry, eldest son of the late Mr Edwin Bradley, to Jessie Bertha, youngest daughter of Mr Samuel Oliver, No. 3 Line, Wanganui.

Result from birth search on New Zealand BDM website in August 2018:
1876/12432. Oliver, Jessie Bertha. Mother: Janette. Father: Samuel

New Zealand Electoral Roll - Wanganui Roll 1899, found in March 2022:
Oliver, Jessie Bertha, No. 3 Line, spinster, residential
Oliver, Samuel, No. 3 Line, farmer, freehold, section 73, left bank Wanganui River [Father]
Oliver, Ada, No. 3 Line, spinster, residential [Sister]
Oliver, Louis, No. 3 Line, farm labourer, residential [Brother]