Her probable birth, with the name of Lucy, not H or J as on the censuses, and Hampstead then being in Edmonton:

Surname First name(s) District Vol Page
Births Mar 1844   (>99%)
SHARPE Sarah Lucy Edmonton 3 149
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Her marriage:

Surname First name(s) District Vol Page
Marriages Jun 1865   (>99%)
Binge Thomas Islington 1b 503   
Courtauld Sydney Islington 1b 503   
Halls   Ellen Islington 1b 503   
Sharpe Sarah Lucy Islington 1b 503

And in the 1871 census, it was clear that she married Sydney Courtauld:and they had a son William:

Name Relation Condition Sex Age Birth Year Occupation  Where Born

COURTAULD, Sydney Head M 31 1840   Crape Manufacturer  Essex, Bocking
COURTAULD, Sarah L Wife F 27 1844 Middlesex, Hampstead
COURTAULD, William J Son M 10m 1871 Middlesex, Hampstead
ELLISTON, Harriet Servant F 31 1840 Essex, Soxearth (?)
JARRETT, Sarah A Servant F 22 1849 Kent, Whormsell (?)
THOROGOOD, William Servant M 60 1811 Essex, Netherfield
THOROGOOD, Rebecca Servant F 43 1828 Essex
MAJOR, Esther Servant F 14 1857 Suffolk

RG number: RG10 Piece: 1701 Folio: 16 Page: 4    

Registration District: Braintree Sub District: Bocking
EnumerationDistrict: 2 Ecclesiastical Parish:

Civil Parish: Bocking Municipal Borough:
Address: Bocking End, East Side Bocking Place, Bocking
County: Essex
____________________

In 1881, son William was not there and they had four new children:

Name Relation Condition Sex Age Birth Year Occupation  Disability  Where Born

COURTAULD, Sydney Head Married M 41 1840 Justice Of The Peace Crape Manufacturer Member Of School Board (Essex)  Bocking, Essex
COURTAULD, Sarah L Wife Married F 37 1844   Hampstead, Middlesex
COURTAULD, Sydney R Daughter Single F 7 1874 Scholar  Bocking, Essex
COURTAULD, Samuel Son Single M 4 1877 Scholar  Bocking, Essex
COURTAULD, Catharine Daughter Single F 2 1879   Bocking, Essex
COURTAULD, John S Son Single M 0 1881   Bocking, Essex
DEATH, Jane Servant Single F 33 1848 Domestic Servant  Ipswich, Suffolk
PRESTON, Eliza Servant Single F 31 1850 Domestic Servant  Brighton, Sussex
KEMP, Susan Servant Single F 29 1852 Domestic Servant  Gt Leighs, Essex
READ, Ann Servant Single F 17 1864 Domestic Servant  Walsham, Suffolk
KNIGHT, Jane Servant Single F 33 1848 Domestic Servant  Petworth, Sussex
CHARLTON, Jessie Servant Single F 18 1863 Domestic Servant  Hammersmith, Middlesex
DINES, Joseph Servant Married M 49 1832 Gardner Servant  Stebbing, Essex
DINES, Martha Servant Married F 50 1831 Gardner Wife  Stebbing, Essex
LEWIS, Emma Servant Single F 58 1823 Gardner Sister  Stebbing, Essex

RG number: RG11 Piece: 1806 Folio: 29 Page: 31    

Registration District: Braintree Sub District: Bocking
EnumerationDistrict: Ecclesiastical Parish:

Civil Parish: Bocking   Municipal Borough:
Address: Bocking End Bocking Place, Bocking
County: Essex
_________________

In 1891 there was one more son, Stephen, born in 1883:

Name Relation Condition Sex Age Birth Year Occupation  Disability  Where Born

COURTAULD, Stephen Lewes Son Single M 8 1883 Scholar  Bocking, Essex

RG number: RG12 Piece: 1422 Folio: 38 Page: 20
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In 1901 she was a widow with the three eldest children in residence but Catharine, John and Stephen absent.

It looks as if she had died by 1911 as their household was gone.

Her death:

Surname First name(s) Age District Vol Page
Deaths Jun 1906   (>99%)
COURTAULD Sarah Lucy 62 Braintree 4a 371
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Their marriage:

Surname First name(s) District Vol Page
Marriages Jun 1865   (>99%)
Courtauld Sydney Islington 1b 503   
Sharpe Sarah Lucy Islington 1b 503