Diadem from the Stars

Abandoned on an alien planet, a young woman gains remarkable powers from a mysterious artifact, in the first installment of a sprawling, unforgettable science fiction saga.
A magnificent combination of space opera and epic fantasy quest in the beloved science fantasy tradition of Andre Norton and C. J. Cherryh, author Jo Clayton's masterful Diadem Saga begins with an unforgettable tale of destiny, self-discovery, survival, and an extraordinary young woman's coming of age in a world that is not her own.
Raised, but never loved, by the barbarian valley people of Jaydugar, a planet of two suns, young Aleytys has always known she did not belong. Abandoned by her space-traveling mother and barely tolerated by a superstitious primitive tribe fearful of divine reprisals, Aleytys is forced to flee for her life following the catastrophic appearance of a fireball in the sky. Guided by her absent mother's journals, the young outcast must now journey alone...