Her article in thepeerage is here.
From Wikimedia; lightness added to image to bring out details of her coiffure.
Anna Maria dispenses with a criss-cross bodice - this dress has a real sewn-in bodice making the waist band an ornament instead of a necessity.
Keywords: 1805, Lawrence, Anna Maria Dashwood, Dashwood family, Loftus family, Marquise, British, curly coiffure, square décolletage, quarter length close notched sleeves, waist band, Empire waistline, close skirt, floral bodice ornament, brooch, bracelets, wrap