Clutching at straws, I wonder if she is related
In 1851 there is a Jane Graham
also born Trinidad H0107/1499 f150 p13 (Islington)
Martha Graham age 70 occ Fund Holder -widow- bn Stepney
Elizabeth Norton-unmarried -age 80 Annuitant- bn London
Jane Graham - unmarried -NIECE- 27- Fund holder bn Trinidad
Martha Norton married David Graham (bachelor) 5 Sep 1814 St George in the East
wit. John Flint. Eliza Norton. Ann Bone.
Death
GRAHAM, MARTHA age 89
1860 March Quarter in ISLINGTON Volume 01B Page 165
Probate names a Henry Graham & Jane Louisa Graham (spinster) as 'two of the executors'
She has an address of Prior Park Buildings in the parish of Lyncombe & Lynton, Bath but died at 2 Upper Hillmarton Villas, Camden Road, Holloway which is the address also given for the executors.
Her husband David died 14 December 1840 address - Prior Park buildings to the inexpressible grief of his wife & friends - Bath Chronicle and Weekly Gazette 17 December 1840. GRO has his age at death as 75. Shame he died before a census.
.............
1861 Jane Louisa Graham with father Henry Graham (bn Scotland c1790) also a relation Sarah S Graham
https://www.familysearch.org/ark:/61903/1:1:Q2M2-X7SXJane Louisa marries a Frederick Carritt in 1867, her father is Henry Graham occ gentleman. Could her father Henry be a brother to Joseph and working in Trinidad with him
In 1861 Jane is in Kingston on Thames, Surrey RG10/861 f7 p5
She dies in Brentford RD - probate index gives address as Ealing
Deaths Jun qtr 1898
Jane Louisa Carritt age 74
Brentford 3a 55
......
Sarah S Graham who was with Jane Louise & Henry in 1861
GRAHAM, SARAH SIMPSON mmn MILBURN
1840 Sept Quarter in EAST STONEHOUSE Volume 09 Page 305
1841 West Emma Place, East Stonehouse, Devon
HO107/276 bk 4 f22 p39
Joseph Graham - 60 - not born in county Independent meansJane Graham -30 - not born in county
William Graham -14 - not bn in county
Ralph Graham - 13 born in Foreign parts
Fanny Graham 7 born Foreign parts
Stewart Graham 5 born foreign parts
Reginald Graham 2 bn Devon
Sarah Graham 10 months bn Devon
Sarah Millburn age 60 not bn in County (Independent means)
GRAHAM, REGINALD LOCKHART mmn MILBURN
1838 Dec Quarter in EAST STONEHOUSE Volume 09 Page 33