Kelli is Paige's friend.
Paige meets her on the bus, when she tries to discover whether Aunt Helen is real. Kelli tells Paige her parents are divorced and cannot even live in the same state as each other. She says she is making the long bus trip twice today, because her mother can't stand for her father to keep her overnight when it's not "his" night.
Kelli gives Paige her phone number and Paige calls her a few days later. Kelli encourages Paige to join her church youth group.