This individual has yet to be securely identified. She is very probably Isabella Frances Mansfield (d.1872), the widow of the Revd William Mansfield (d.1854).
This person is the subject of ongoing research. We have started by researching their relationship to the enslavement of people.
No known connections with slavery.
No known connections with abolition.
National Gallery painting connections
Donor: bequeathed in 1872: NG899 (now at Tate, N00899).
History of Parliament Trust (ed.), The History of Parliament: British Political, Social & Local History, London 1964-, https://www.historyofparliamentonline.org/
Checked and not found — Item on publisher's website