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Enchantress from the Stars (1970)
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Wikipedia in English
Amazon.com Product Description (ISBN 0142500372, Paperback)
Elana, a member of an interstellar civilization on a mission to a medieval planet, becomes the key to a dangerous plan to turn back an invasion. How can she help the Andrecians, who still believe in magic and superstition, without revealing her own alien powers? At the same time, Georyn, the son of an Andrecian woodcutter, knows only that there is a dragon in the enchanted forest, and he must defeat it. He sees Elana as the Enchantress from the Stars who has come to test him, to prove he is worthy. One of the few science fiction books to win a Newbery Honor, this novel will enthrall teenage and adult readers.
(retrieved from Amazon Thu, 12 Mar 2015 18:09:43 -0400)
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.