Who is Cynthia in the story, The Long-Distance Runner?

Cynthia is a Girl Scout in Brooklyn who meets Faith in the street and ushers her into the apartment where Faith lived as a child. While Cynthia encourages Faith to meet Mrs. Luddy, the tenant of the apartment where Faith lived years before, Cynthia is frightened by the idea that Faith could serve her as an adoptive parent if Cynthia's mother were to die.