1778 Mrs. George Hardinge, d. of Richard Long of Hinxton by Sir Joshua Reynolds (auctioned by Christie's)

Her article in thepeerage is here immediately below her husband’s article.

From christies.com/features/Christies-250-anniversary-celebrations-to-be-launched-by-Defining-British-Art-7286-1.aspx?epik=0PpdfE_IWn3Jz.