In the Stephen King novel Desperation Cynthia is a survivor of an abusive relationship and a traveler. She spent some time at the Daughters and Sisters shelter. She is hitchhiking and picked up by Steve Ames. At the time she is wary, but for some reason decides that Steve is okay and stays with him even after they arrive at Desperation, Nevada and the situation turns decidedly horrific. Cynthia is intelligent, brave and resourceful. She stays with the task even though every nerve in her body is screaming to run.
In The Regulators, which is set in a different universe than Rose Madder and Desperation, Cynthia works at a grocery store at the end of Poplar Street in Wenworth, Ohio. She is easily recognized by her two tone hair, which is half orange and half green. As in Desperation she and Steve end up together and both manage to survive the alternate reality encounter with Tak.