Chawton House is associated with the Knight and Austen families, possibly a John Knight described tersely in thepeerage who was a prosperous Jamaican planter. The original caption says the portrayed Lady died in 1737, but both thepeerage and geni.com state that John Knight’s daughter Elizabeth died in 1731. The keywords are assigned assuming Elizabeth Knight is the one covered in thepeerage and geni.com.
From artuk.org. Also posted in the Reign of Louis XV - 1715 to 1744 Album here.