Bailey Graffman (April 23, 1993 - August 28, 2005) is the 12-year-old that Tibby meets in The first Sisterhood pants book. She's a fun and mature 12 year old.
In the first novel, Bailey met Tibby when she passed out in the store where Tibby worked. Bailey then brought one of Tibbys packages to her house because they were misplaced and she convinces Tibby to let her be her assistant. One day Tibby goes to her house and finds out she has leukemia, since then she treats her differently and visits her at the hospital. Bailey dies in bed with Tibby by her side :(