Beverly, Right Here by Kate DiCamillo
Beverly Tapinski has run away from home plenty of times, but that was when she was just a kid. Now that she's fourteen years old, she figures it's not running away, it's just leaving. Determined to make it on her own, she finds a job and a place to live and tried to forget about her dog. If you love other books by Kate DiCamillo, this one will not disappoint you.