Her biographical sketch is here.
From history-of-fashion.tumblr.com/page/5. Also posted to the Revolutionary, Napoléonic, and Romantic Era Album here.
French style was in confusion in 1790, but Lady Honyman is dressed in keeping with pre-Revolutionary British casual style.
Keywords: 1790, Nasmyth, Mary MacQueen, Lady Honyman, MacQueen family, Honyman family, British, long curly coiffure, ribboned hat, fichu, vee neckline, fitted bodice, trapezoidal neckline, long tight sleeves, ruffled cuffs, waist band, natural waistline, close skirt, shoes