Her baptism index:

First name(s) EMILY CATHERINE POWYS
Last name WILKINS
Birth year 1832
Birth day -
Birth month -
Baptism year 1832
Baptism day 13
Baptism month Sep
Place LLANFRYNACH
Mother's first name(s) Anne
Father's first name(s) John Parry
County Breconshire
Country Wales
Record set Powys Baptisms
Category Birth, Marriage, Death & Parish Records
Subcategory Births & baptisms
Collections from Great Britain
Welsh Archive Services / Gwasanaethau Archifau Cymru
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The family changed their surname by RL in 1839 to DeWinton.

And this was what she was married with.
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In 1861 she, hubby, daughter and son were at her father-in-law’s; he had three middle aged spinster daughters with him:

First name(s) Last name Relationship Marital status  Gender  Age  Birth year  Occupation  Birth place

George Cobb Head Widower Male 73 1788 Landed Proprietor  Neithrop, Oxfordshire,
Sophia W Cobb Daughter Unmarried Female 46 1815 -  Broughton, Oxfordshire
Matilda T Cobb Daughter Unmarried Female 45 1816  -  Broughton, Oxfordshire
Charlotte A Cobb Daughter Unmarried Female 43 1818  -  Broughton, Oxfordshire
William Warding Servant Married Male 43 1818 Footman  Purton, Herefordshire
Mary A Handrick Servant Married Female 50 1811 Cook  Semington, Wiltshire
Selina Abbotts Servant Unmarried Female 31 1830  House Maid  Bretforton, Worcestershire
Joseph R Cobb Son Married Male 38 1823 Solicitor Broughton, Oxfordshire
Emily P Cobb Daughter In Law Married Female 28 1833  -  Broom, Wales
G E Whatley Cobb Grandson - Male 2 1859 - Brecon, Buckinghamshire
Ann Adams Servant Unmarried Female 28 1833 Nurse Maid  Cradley, Herefordshire
Lucy P Cobb Granddaughter - Female 3 1858 -  Brecon, Buckinghamshire

The house was:
House name Coniger Villa
Street Holly Walk
Parish Leamington Priors
Town Leamington
County Warwickshire

Census Ref:
Archive reference RG09
Piece number 2223
Folio number 52
Page number 4
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In 1871 she had five children and was living in Brecon with a large household:

First name(s) Last name Relationship Marital status  Gender  Age  Birth year  Occupation  Birth place

Joseph R Cobb Head - Male 49 1822 -  Oxfordshire
Emily C P Cobb Wife - Female 38 1833 -  Breconshire, Wales
Lucy P Cobb Daughter - Female 13 1858 -  Breconshire, Wales
Geoffry E W Cobb Son - Male 12 1859 -  Breconshire, Wales
Mabel P Cobb Daughter - Female 9 1862 -  Breconshire, Wales
George W Cobb Son - Male 7 1864 -  Breconshire, Wales
Richard W Cobb Son - Male 4 1867 -  Breconshire, Wales
Ann Adams Nurse - Female 40 1831 - Worcestershire
Margaret Treherne Cook - Female 46 1825 - Glamorgan, Wales
Charlotte Hughes Servant - Female 40 1831 -  Worcestershire
Fanny Adams Servant - Female 22 1849 - Worcestershire
Charlotte Twinborne Servant - Female 20 1851  -  Worcestershire
Susannah Cox Servant - Female 18 1853 - Worcestershire
Thomas Griffiths Servant - Male 22 1849 - Herefordshire

Address:
Street Nythfa
Parish St John
Town Brecon
City Brecon
County Breconshire
Country Wales

Census ref:
Archive reference RG10
Piece number 5579
Folio 120
Page 29
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In 1881 an extra son, Edwards was on the scene and Lucy and George were not there:

First name(s) Last name Relationship Marital status  Gender  Age  Birth year  Occupation  Birth place

Joseph R Cobb Head Married Male 59 1822  Solicitor Farmer Of 120 Acres Employing 1 Person  Oxfordshire
Emily C P Cobb Wife Married Female 48 1833  -  Brecknockshire, Wales
...
Edward P W Cobb Son Single Male 7 1874  Solicitors Son  Brecon, Breconshire, Wales

Address:
House name Nythfa
Parish Brecknock St John the Evangelist Aka Upper Division
County Breconshire
Country Wales

Census Ref:
Archive reference RG11
Piece number 5458
Folio 116
Page 25
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In 1891 Joseph had retired, George was back and a farmer.  Richard was an engineer’s assistant and the rest were absent.
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her death index:

First name(s) EMILY CATHARINE P
Last name COBB
Gender Female
Birth year 1833
Age 67
Death quarter 2
Death year 1900
District BRECKNOCK
County Breconshire
Volume 11B
Page 71
Country Wales
Record set England & Wales deaths 1837-2007
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Her burial index:

First name(s) EMILY CATHERINE POWYS
Last name COBB
Age 67
Birth year 1833
Death year 1900
Day 08
Month Apr
Residence Nytha Saint Johns, Brecon
Church St. Mary
Place CALDICOT
County Monmouthshire
Country Wales
Record set Gwent FHS Burials - Chepstow Branch
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The death duty register says she died on 13th April 1900, 5 days after she was buried!  A little more detail is needed, probably from her death certificate, to sort this out.

The GWR Share Register also says she died on 13th, quoting the Probate from the Principal registry.  The names on the account as well as hers were:
Geoffrey Edward Wheatley Cobb,
Edward Powys Wheatley Cobb.
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Their marriage index:

First name(s) EMILY CATHARINE POWYS
Last name DE WINTON
Marriage quarter 1
Marriage year 1856
Registration month -
MarriageFinder™ EMILY CATHARINE POWYS DE WINTON married one of these people
JOSEPH RICHARD COBB, DAVID PHILLIPS
District BRECKNOCK
County Breconshire
Country Wales
Volume 11B
Page 177
Record set England & Wales marriages 1837-2008
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Their Banns, indicating a marriage in March:

First name(s) JOSEPH RICHARD
Last name COBB
Banns year 1856
Banns day 16
Banns month Mar
Marriage year 1856
Place LLANFRYNACH
Spouse's first name(s) EMILY CATHERINE
Spouse's last name WINTON
Bride's parish Llanfrynach
Groom's parish St Marys
County Breconshire
Country Wales
Record set Powys Banns
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