Keena Ford and the Secret Journal Mix-Up by Melissa Thomson
Published by Puffin,2011
Keena Ford loves writing in her journal. She keeps all of her thoughts in there, even if they are sometimes not-so-nice. One day, Keena accidentally leaves her journal in Tiffany Harris's apartment, and Tiffany tells Keena that she's going to tell all of Keena's secrets! With help from her brother, some classic fables, and a visiting author, Keena discovers what she must do to stand up to Tiffany and make things right with her friends.