Only these two years before first marriage, Ozn.
1919 & 1924 VIC Electoral Roll - Bendigo - Sutton
KILFEDER Olive May, 354 Barnard st., Bendigo, home duties
And these after 2nd marriage so 2nd marriage using maiden name.
1937 VIC Electoral Roll - Bendigo - Bendigo
SOMERVILLE Olive May, 100 Garsed st., clerk
1943 VIC Electoral Roll - Fawkner - South Yarra
SOMERVILLE Olive May, 57 Adams st., clerk
1949 & 1954 VIC Electoral Roll - Melbourne Ports - Albert Park
SOMERVILLE Olive May, No. 32, 67 Queen's rd., S.C.3, clerk
The death reg is quite clear:
Australia Death Index, 1787-1985
Name: Olive May Somerville
Death Place: Want, Victoria = Wantirna
Age: 86
Father's name: John C Kilfeder
Mother's name: Bertha Emily
Registration Year: 1983
Registration Place: Victoria
Registration Number: 28611
Dave