Theres just one Minnie Waters showing up - middle name Blanche ? She never married. She is on the 1911, 1914, 1928, 1935, 1938, 1946, 1949, 1954 &1957 electoral rolls. Living in Auckland on the North Shore.
The only Minnie Attwood 's I can find are three Dorothy Minnie Attwood's and a Minnie Lister Attwood.
The Dorothy Minnie's are all only appearing on the 1928 roll, one in Waikato,a spinster, one in Auckland East also a spinster, and one in Parnel who is also a spinster. So its none of those ladies. They all vanish off the rolls after '28 too. Its quite odd!
Minnie Lister Attwood is on the 1919, 1928, 1935, 1938, 1946, 1949, 1954, 1957, 1963, & 1969 rolls, living in Canterbury. She is married to an accountant named Horace