Hi Ian
In Memoriam notices published in Wellington newspapers tend to suggest Maria UPCHURCH who died 12 June 1918, was probably the former Maria CLAPHAM.
"Evening Post" - - 12 June 1919 - 2 notices = one inserted by her "loving son Joshua".
and "E/Post" - 12 June 1920 = a notice from "her loving husband and daughter
*" :
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Maria UPCHURCH buried at Karori Cemetery Wellington :
Her husband James UPCHURCH - died 1924 - shares same plot.
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James UPCHURCH had remarried in 1921 to a Sarah Jane TAYLOR.
He died intestate in 1924. In his Probate file (1924) his new wife Sarah Jane states James has a former marriage, with no issue
*.
* So is the "daughter" referred to in the In Memoriam notice of 1920, maybe Helen (CLAPHAM) daughter of Maria

~ Lu