Fascinated by Tibby's movie, or "suckumentary" as she calls it, Bailey becomes Tibby's self-appointed assistant. Tibby is annoyed by this at first, but gradually grows to accept Bailey. She later learns from Bailey's neighbor that Bailey has
leukemia.
Bailey eventually goes to the hospital with a bad infection. Tibby avoids the hospital for a while, but eventually visits Bailey, bringing the Traveling Pants. She offers them to Bailey and pleads with her to take them so that they can help her. Bailey responds by saying that the pants have already worked their magic on Bailey by bringing her and Tibby together. Tibby spends a lot of time with Bailey in the hospital after that. A couple of days later, Tibby receives a phone call in the morning from Mrs. Graffman, Bailey's mother, saying that Bailey died in the night.
Sadly, the pants cannot cure cancer.