Unfortunately, she bumps into some redneck desert dwellers who take advantage of her kindly nature. They kidnap, violate and torture her.
With her cast into the desert at the point of death, a shamanic local uses his ability to connect this world and the next and the spirit of a vengeful indigenous chief leaps into her empty vessel. 'Together' they go and, well, mash the fuck out of the bad guys.
This sounds awful, and pretty much any description of the film's plot will make it sound like thunderous fucking arse, however, as far as supernatural revenge films go, it's an absolute belter. Very, very entertaining, exciting and fun. Much better than we expected.