There was a Mary Jane Petherick born abt 1876, waipawa, married 3 Dec 1894, at Herbertville, Hawkes Bay, to Alfred Whitehead, she died 16 Aug 1945 at Dannevirke, my late step grandmother's family. So do not have the marriage cert, can't locate her on the Reg generals site as Petherick.
Just in case she ties in with your lot
Regards Colin