Mattie Gormer belongs to a social circle below Wellington and Louisa Bry’s, and initially seems more interested in throwing exciting, relaxed parties than in social climbing, but she ultimately proves just as vulnerable as other members of society to ambition and manipulation. Despite her apparent affection for Lily Bart, Mattie does not hesitate to reject Lily after becoming friends with Bertha Dorset, proving just as unreliable and unfaithful as members of high society.