Halverson Dorothy Doris Marie

I am trying to find my grandmother who supposedly married Jack Wilmot Fink in 1914. She did not actually marry him because she was already married to a Frank Buckley. She had a daughter to Frank Buckley supposedly. Her name was Alma or Amy not sure which. She came to New Zealand and had three more children, Clarry Fink, Thelma Fink and Dorothy Fink. She abandoned them and disappeared. I think she went back to Australia to connect with her daughter Alma. I see there is a death notice of a Dorothy Fink in 1937 in Melbourne. If anyone knows anything about this and where Dorothy Fink is buried could they please contact me. Also I would like to know where my grandfather Jack Wilmot Fink is buried also, I presume they were not buried together. No disrespect to my grandmother, but I do wonder why she left her three children in New Zealand and never came back or contacted them again.