The Summer of the Swans by 
Enchantress from the Stars by
When young Elana unexpectedly joins the team leaving the spaceship to study the planet Andrecia, she becomes an integral part of an adventure involving three very different civilizations, each one centered on the third planet from the star in its own solar system.
Sing down the Moon by
A young Navajo girl recounts the events of 1864 when her tribe was forced to march to Fort Sumner as prisoners of the white soldiers.