The Chinook River Princess — Jack Duckworth

In The Judgment Ring books, the angels of darkness and light compete for human souls by using the Judgment Ring, a golden serpent that wraps itself around the finger and bites its own tail, as a scorekeeper. In this first book, a girl named Mary is orphaned, and inherits the ring. At 17, she arrives in Idaho as a mail-order bride. She is dogged with disasters which push her non-violent nature to the ultimate test.