Hi, I am Nathan, grandson of Joseph James Malone. Joseph was Nellie's sister. I read your post concerning Nellie Wright (nee.Malone), and thought I could provide some reasons for the gaps you are having difficulty over.
Nellie was placed into Tokanui Hospital near Te Awamutu at some stage, and I think she may have died there, according to what my family told me. Sefton Cecil Wright, her husband, apparently was a good man, and he moved to Te Awamutu or Cambridge to be closer to his wife.
Such things were kept hidden in those days, unlike our more open society these days. I hope this explains a few things for you.