In the 1861 census, her name had become Maria.

In 1881 they had 4 children with them:

Name Relation Condition Sex Age Birth Year Occupation  Disability  Where Born

ROWLEY CONWY, Conwy Head Married M 40 1841 Magistrate No Oc  Rhuddlan, Flintshire
ROWLEY CONWY, Marian Wife Married F 38 1843   Bray, Berkshire
ROWLEY CONWY, Gwladys Daughter Single F 8 1873   London, Middlesex
ROWLEY CONWY, Maurice Son Single M 7 1874   Rhuddlan, Flintshire
ROWLEY CONWY, Rafe Son Single M 5 1876   Rhuddlan, Flintshire
ROWLEY CONWY, Geoffrey Son Single M 3 1878   Rhuddlan, Flintshire
KENRICK, Herbert Visitor Single M 28 1853 Land Agent  Ruabon, Denbighshire
WYNNE, Edward Visitor Single M 45 1836 Colonel Half Pay  Bettws Yn Rhos, Denbighshire
WEBB, Sarah Ann Servant Single F 35 1846 Housekeeper  Servant  Bexley Heath, Kent
FOSTER, Elizabeth Servant Single F 29 1852 Lady's Maid  Esher, Surrey
CUPPER, Elizabeth Servant Single F 36 1845 Nurse  Brandfield, Suffolk
EDWARDS, Margaret Servant Single F 19 1862 Undernurse  Llanrhaiadr, Montgomeryshire
CAFFELL, Harriett Servant Single F 35 1846 Housemaid  Fownhope, Herefordshire
JONES, Maria Servant Single F 19 1862 Housemaid  St. George, Flintshire
HUGHES, Sarah Servant Single F 21 1860 Housemaid  Rhuddlan, Flintshire
ROBERTS, Anne Servant Single F 32 1849 Dairymaid  Denbigh, Denbighshire
WOOD, Jane Servant Single F 26 1855 Kitchenmaid  Farden, Montgomeryshire
SIDE, Pamela Servant Single F 16 1865 Scullerymaid  Oswestry, Shropshire
NEWMAN, James Servant Married M 36 1845 Butler  London, Middlesex
DAVIES, Charles Servant Single M 26 1855 Footman  Dorset
SMITH, Robert Servant Single M 19 1862   Footman  Derbyshire
ROBERTS, John Servant Single M 19 1862   Yard Boy  Llanrhaiadr, Denbighshire

RG number: RG11 Piece: 5527 Folio: 126 Page: 42    

Registration District: St Asaph Sub District: St Asaph
EnumerationDistrict:  Ecclesiastical Parish:

Civil Parish: Rhuddlan (Flint) Municipal Borough:
Address: Bodrhyddan Hall, Rhuddlan (Flint)
County: Denbighshire
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In 1901 she was living at home, a widow and with her son Rafe with her.
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I wonder if these children were also hers and d. as infants?

Surname First name(s) District Vol Page
Births Dec 1871   (>99%)
CONWY Leveson Glyn St. Asaph 11b 322   
Births Dec 1875   (>99%)
Conwy Margaret Ann St. Asaph 11b 346   
Births Dec 1879   (>99%)
Conwy Barbara Gwenllian St. Asaph 11b 319   

Leveson Glyn died aged 2, Barbara Gwenllian died aged 0.
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The Times announcements:

A birth of a son to Mrs Rowley-Conwy on  the 25th Aug 1870.

And a daughter at 7 Grosvenor Gardens on 29th Feb 1873 - Must be Gwladys.

6 Sep 1911: Her death on 5th Sept at Bedrhyddan, Rhuddlan, N Wales

6 Sep 1911: Obit: “The death too place yesterday at Bedrhyddan, Rhyl, of Mrs Marian Rowley-Conwy, widow of the late Capt Conwy Granville hercules Rowley-Conwy, owner of large estates in Wales and ireland.
“Mrs Rowley-Conway, who was about 70 years of age, was a daughter of the late Colonel F P Harford, of Down Place, Windsor, formerly in the 2nd Life Guards, who was a representative of a family settles at Rhuddlan since the time of Edward I, and was the great-grandson of Dean Shipley, of St Asaph.  Captain Rowley-Conwy died in 1900.  There were four sons and one daughter of the marriage.”

12 Jan 1912: Announcement that her estate has a gross value of £179,366 and a net personality of £9,411.