Elizabeth Burton was a painter who lived near Eakins. Before this work could be completed, she left Philadelphia for British North Borneo (now the state of Sabah in Malaysia).
(https://collections.artsmia.org/art/577/portrait-of-elizabeth-l-burton-thomas-eakins)
Three-quarter figure facing spectator, right hand on back of chair; left on hip. Hair worn in pompadour style of early 20th century. Greyish-blue taffeta dress trimmed with ruching of cocoa brown silk. (Wikipedia)