The article in thepeerage for her is here.
From the USA Library of Congress Bain Collection; scratches and spots removed with Photoshop.
The spyglass-like folds of Lady Dufferin's sleeves and waistline suggest this portrait dates to the late 1890s.
Keywords: Florence Davis, Marchioness of Dufferin, Countess Howe, Blackwood family, Marquise, frizzy coiffure, feathered hat, high enclosing neckline, scarf, bertha, lace, epaulettes, spyglass sleeves, waist band, natural waistline, close skirt, necklace, draped necklace, jeweled crucifix