A Girl Called Nine — Valery Keith

When Rand Matthews witnesses a teen runaway attack a man in a diner, only to find her leaping out of his truck bed once he returns home to his ranch, he's at a loss. There's something strange about this girl, like she's been mistreated or abused.  

Worried about how the child might have gotten that way, Rand is determined to help her. As he and his ranch-hand Cole learn more about her and the events which brought her to the ranch, they soon realize that their new house guest is no ordinary girl....