Hi Alice
Just looking at the NZ electoral rolls (index only), it seems your great-grandmother used just the name "Maud" (rather than "Maud
e" - or with another christian name).

Maud is shown (along with George Boyer FIVEASH) at the following locations.
1928 to 1938 - at Mataura
1946 to 1957 - at Westland
1963 at Marlborough (last listing for Maud - though George is still there in 1972.)
~ Lu