In 1908, when she inserted her mother’s death notice in the Times, she was living at Roseholme, Ashford, Middlesex.

I have been informed that she and Robert had about six children, some of whom survived and even one or two may have descendants who will be very distantly related to us.  As ever when finding descendants, it will take some time to find them, if at all.
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She was head of house in the 1881 census, at 58 Wilbury Road, Hove, Sussex:

Name Relation Marital Status Gender Age Birthplace  Occupation  Disability

Etheldreda HAILSTONE Head     U  Female  22  Bradford
Sarah H. HAILSTONE Mother   M  Female  48  Bingley, York, England
William E. HAILSTONE Brother  U  Male    16  Bradford, York, England
Eliza J. UNDERWOOD Serv     W  Female  28  Wellingboro, Northampton, England   Nurse (Dom)
Jane THOMPSON         Visitor  M  Female  64  Scruton, York, England   Wife Of The Undermentioned  
William THOMPSON      Visitor  M  Male    52  Thorne, York, England  Retired Farmer
Eleanor AYLING        Serv     U  Female  21  Brighton, Sussex, England   Housemaid
Louisa DEWDING        Serv     U  Female  16  Brighton, Sussex, England   Kitchenmaid

Her age of 22 gives a birth year of 1859
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No death record on FreeBMD up to 1910.
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In 1901 census:

Research Log Surname Forename Age Relation  Occupation  Birth Place

Carter Robert 48 Head Solicitor Marylebone, London
Carter Etheldreda 42 Wife Bradford, Yorkshire
Carter Wilfred R 17 Son Articled Clerk Twickenham, Middlesex
Carter Etheldreda L 15 Daughter Twickenham, Middlesex
Carter Hilda A 13 Daughter Sunbury, Middlesex
Carter Iva B 12 Daughter Sunbury, Middlesex
Carter Norman H 11 Son Sunbury, Middlesex
Carter Robert 22 Nephew Tutor School Marylebone, London
Ref: RG13/1814/~F28

Address: 31 Cliff Hill
Parish: Gorleston
Registration District: Yarmouth
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In 1911 census she had had 6 children of whom 5 survived.  So where was Norman, then aged 21:

Surname Forename Age Gender Relation  Marriage Status  Years Married  Occupation  Birth Place

Carter Robert 58 Male Head Married 28  Solicitor  Marylebone, London
Carter Etheldreda Lilla 53 Female Wife Married  28  Bradford, Yorkshire
Carter Wilfred Robert 27 Male Son Single - Solicitor  Twickenham, Middlesex
Carter Etheldreda Louisa 25 Female Daughter  Single  -  Twickenham, Middlesex
Carter Hilda Audrye 23 Female Daughter Single  -  Sunbury, Middlesex
Carter Ina Branca 22 Female Daughter Single  -  Art Student  Sunbury, Middlesex

Ref: RG14 - PN6725 RD126 SD1 ED1 SN16

Address: Roseholme, Stanwell Rd, Ashford, Middlesex
Registration District: Staines
Sub District: Sunbury
Civil Parish: Ashford
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Her death:

Surname First name(s) Age District Vol  Page
Deaths Jun 1929   (>99%)
Carter Etheldreda L 70 Hastings 2b 31
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