Welcome jazzthel.

Is this Harriet's death?

Harriet Sophia CONQUEST.
Died: 1963 Carnegie, Victoria.
Age: 80 years.
Father: Unknown SALTER.
Mother: Unknown.
Ref: Registry of Deaths, Victoria. Reg #26199.

DEATH.

Alfred Llewellyn CONQUEST.
Died: 1933 Heidelberg, Victoria.
Age: 50 years.
Father: Alfred CONQUEST.
Mother: Margaret SMITH.
Ref: Registry of Deaths, Victoria. Reg #2191.

Not sure if the Harriet and Alfred above are the ones you seek but I found the deaths of two, possibly three, of their children.

Henry CONQUEST.
Died: 1927 Prahran, Victoria.
Age: 14 years.
Father: Alfred CONQUEST.
Mother: Harriet SALTER.
Ref: Registry of Deaths, Victoria. Reg #3193.

Elsie KENNY.
Died: 1978 Clayton, Victoria.
Age: 69 years.
Father: Alfred Lewel CONQUEST.
Mother: Harriet Sophi SALTER.
Ref: Registry of Deaths, Victoria. Reg #5218.

Roy CONQUEST.
Died: 1983 Scarsdale, Victoria.
Age: 60 years.
Father: Alfred Lewell CONQUEST.
Mother: Harriet Sophia. (Maiden name not recorded)
Ref: Registry of Deaths, Victoria. Reg #17357.

Hope the above is of some help.

Cheers.

Could this be your Harriet ?

Australia Birth Index, 1788-1922
Harriet Sophia Blanche Salter
FATHER'S NAME: Henry Salter
MOTHER'S NAME: Charlotte Sophia Ridgeway
BIRTH PLACE: St Kilda, Victoria
REGISTRATION YEAR: 1884
REGISTRATION PLACE: Victoria
REGISTRATION NUMBER: 28049

Harriet Sophia SALTER
birth: 1884 St.Kilda, Victoria
............................................
Parents
Henry James SALTER
birth: 1854 Surrey, England
death: 1930

Charlotte Sophia RIDGWAY
birth: 21 October 1858 Clyde, Vic, Austl
death: 1941
...................................................
Charlotte'sparents:

Anthony RIDGWAY
birth: 30 March 1821
death: 27 January 1890

Sophia CADD
birth: 8 August 1826
death: 30 June 1904
.......................................................

Other children of James and Charlotte:

Henry James SALTER
birth: October 1881
death:

Martha Maude Alice SALTER
birth: 10 February 1883
death: 28 October 1956

Harriet Sophia SALTER
birth: 1884
death:

William John SALTER
birth: 1887
death:

George Edward SALTER
birth: 1888
death: 25 January 1916

Emma Ruby Florence SALTER
birth: 1890
death:

Ethel Rose May SALTER
birth: 1893
death:

Alfred Percy SALTER
birth: 1895
death:

Lila Olive Myrtle SALTER
birth: 1896
death:


Source: FamilySearch

Would advise you double check ALL the above, details submitted by other researchers

thanks. This would be the right person as she lived and died in Carnegie.
The names Roy and Elsie I am familiar with but not Henry.

There are other children, William, Lorna,Eugene,Alfred, Thelma (my mother)
I have also heard of the name Ridgway as being relevant but not how.

{b]The Argus Saturday 25 March 1933
FUNERAL
CONQUEST.— The Friends of the late Mr. ALFRED CONQUEST are respectfully notified
that his funeral will leave the eastern end of No. 10 platform, Flinders street (per mortuary train), THIS DAY (Saturday), at 1.40, for the Necropolis, Springvale, arriving at or about 2.15 pm
This story below is off topic but the boy's name made me smile and you never know Norman Conquest just may be related.
Bendigo Advertiser, Monday 31 March 1913
JOHN MURRAY ABSCONDERS
On Friday Norman Conquest and Alfred
James Dyhall, each aged 14 years, who had
absconded from the training ship John
Murray, were lodged at the Gordon Institute
by the Prahran police. Early this morn-
ing the lads made their escape from the
institution by climbing a fence, and are
now being caught by the police. Conquest
got away clad only in his pyjamas, while
his companion had on only a pair of knic-
kerbockers and a coat.