While this movie is quite an adventure movie for the girls, and for an eccentric London psychologist, at its heart this movie is about the power of prayer. Nothing seemed to be going right in Zoe's life - uncaring parents, kicked out of school, trouble on their trip, etc. It wasn't until she reached New Mexico and met her first real-life American Indian, and was able to talk to him, that she sensed what she needed to do to make sense of her life.
It was common for young men to go out into the wilderness to seek out the will of the Great Spirit - their vision quest. This was often done totally naked, as if the young man was one with Nature. After he comes back to the tribe, he is then considered to be an adult. When Zoe learns of this practice, she disappears into the desert, also totally naked, to seek the Great Spirit and to find the meaning of her troubled life. She spends several days in a state of deep, meditative prayer. Although she almost dies, and her mother again rejects her, she soon realizes that the Great Spirit has answered her prayer. Her life begins anew.
The skill with which the Spiritual message is woven into an adventure, girl-buddy travel movie should be studied by those who purport to make so-called Christian movies. All the previous reviewers of this movie gave it five stars. I think this is because this film subtly addresses the deep human yearning to know one's place on earth, the meaning of life, or that God cares for each and every one of us. While you are enjoying an adventure movie, you are feeling a Spiritual movie.