 Lefferts illustrated books and designed dust jackets for American book publishers in the 1920s and 1930s.Books that credit her as illustrator include Elaine Sterne Carrington's "The Gypsy Star" (1928) and Laura E. Richards' 1935 book of children's verses, "Merry-Go-Round".Lefferts' name or her distinctive "W.E.L."