Who is Le Cordre from The Lais of Marie de France and what is their importance?

Le Codre appears in Le Fresne. She is Le Fresne's twin sister, from whom she is separated at birth by their mother. Le Codre marries Gurun, but when Le Fresne's true identity is discovered, her marriage is annulled. She is later married to another wealthy nobleman. By coincidence, she is also named for a tree. Le Codre means "hazelnut tree".