Margaret Curzon Hale, née Marquand, was wife of the architect Herbert Dudley Hale. The Hales seem to have known JW in Paris.
When JW quarrelled with Sir William Eden (1849-1915), painter and collector [more] over Brown and Gold: Portrait of Lady Eden (YMSM 408), a portrait of Eden's wife, he painted out the figure of Lady Eden and replaced it with a portrait of Mrs Hale. During the Civil Tribunal court hearing in Paris on 27 February 1895, Mrs Hale sat beside JW in the same dress in which she had posed for the picture. She is referred to in JW's correspondence in 1895 (#06626).
Young, Andrew McLaren, Margaret F. MacDonald, Robin Spencer and Hamish Miles, The Paintings of James McNeill Whistler, New Haven and London, 1980.