An American woman who has been left relatively poor by her late husband, Susan writes for magazines in order to support herself. She meets Milly Theale and, through a developing friendship in which Milly truly wants to provide for Susan, the two agree to travel to Europe together. Susan is older and sees caring and protecting Milly as her new purpose in life. She is portrayed as a woman who is sincere, cares deeply for Milly and who is determined to remain with Milly until she succumbs to her illness. After Milly's death, Susan returns to America but maintains contact with Maud Lowder, a childhood school friend, through correspondence.