Escape from Fire Mountain (Gary Paulsen World of Adventures‪)‬

Thirteen-year-old Nikki Roberts tries to help two children trapped by a forest fire but finds her efforts blocked by poachers who want her to become one of the fire's victims. But after a shocking turn of events, the fire becomes the least of Nikki's problems.
Will Nikki's horse, Goblin, and her years of hunting guide experience save her, or will Fire Mountain reign supreme?