It appears she changed her name but kept her initials....perhaps she didn't divorce Horace 
MARRINER.  Who is Mr 
HAYWOOD or perhaps there wasn't there one?
Marriage
SIMONSEN Walter
HAYWOOD Emily Carlone
1926  Reg# 1411
http://mapping.fcmp.com.au:1001/Pubmapping/index.aspxSIMONSEN  Emma C  54 years
Cremated  26 Mar 1956
Scattered Cremated Remains On Request
http://nla.gov.au/nla.news-article140764325The Australasian  8 Nov 1924
To save the life of Walter Simonsen, whose arm was nearly wrenched off in a machine at the Mississippi sawmill, 12 miles from Warburton, David Gray, an other employee at the mill, gave a pint of his blood to be transfused into the injured man. The transfusion, it is said, saved his life.
http://nla.gov.au/nla.news-article12092395The Argus  1 Feb 1939
I, Walter Simonsen, of Danish nationality, born at Odense, and resident 20 years in Australia,  
now residing at Wood's Point, intend to Apply for Naturalisation under the Nationality Act 1920-1936.
http://www.naa.gov.au/collection/search/index.aspxSIMONSEN Anders Christon; 
Date of naturalisation - 25 Jul 1939 
Previous nationality - Danish  Place of birth Odense, Denmark 
Year of birth - 1892  Place of residence - Woods Point, Vic; 
Additional Information - 
Known as SIMONSEN, Walter; [W] SIMONSEN, EmilyI did wonder if this was the same man....place of birth a match but this man is two years younger.  NOK not Emma though.
http://www.ww2roll.gov.au/Veteran.aspx?serviceId=A&veteranId=557345Australian Electoral Roll
1943
SIMONSEN Emily Carlone  44 Barkly Street, Carlton  HD
1949
SIMONSEN Emily Carlone  16 Moor Street, Fitzroy  HD
1954
SIMONSEN Emily Carlone  16 Moor Street, Fitzroy  HD
SIMONSEN Walter Anders C,  16 Moor Street, Fitzroy  Clerk
1958, 1963
SIMONSEN Anders Christian 
W,  Bourke Street, Mt Evelyn  Occupation  Nil
Walter's death
SIMONSEN Andres Christian
Parents unknown
At Footscray  71 years  1964  Reg#24416
Probate file at Public Records Office
http://prov.vic.gov.au/index_search?searchid=54SIMONSEN Anders Christian Walter Retired  West Footscray 5 Nov 1964 619/092 
VPRS 28/P4, unit 3318; VPRS 7591/P3, unit 562 
Cando