Muriel was an art student, who modelled to JW for several paintings. She later married (Smith was her married name) and emigrated to South Africa.
The paintings for which she posed included Blue and Coral: The Little Blue Bonnet (YMSM 500), Grey and Silver: La Petite Souris (YMSM 502), Violet and Blue: The Red Feather (YMSM 503). It is possible that she attended the Académie in Paris.
Information from family records.