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The Keeper of the Isis Light (original 1980; edition 2000)
The Keeper of the Isis Light by Monica Hughes (1980)
Amazon.com Product Description (ISBN 0689833903, Paperback)
It was her tenth birthday on Isis. By Earth years, she would be sixteen. But Olwen Pendennis had never been to Earth. She had been born on Isis. And since her parents' death, she had lived there alone, manning the Isis Light -- a "lighthouse" in space designed to aid ships, and to bring settlers from Earth.
And now, on the day of her tenth year, the settlers are coming at last. Olwen is ready to welcome them, but are they ready for her? She was once human, like them. But the harsh climate of the alien planet has changed her, transformed her into something else -- something the settlers could never be prepared for...
(retrieved from Amazon Thu, 12 Mar 2015 17:59:21 -0400)
Sixteen-year-old Olwen, who lives alone on the planet Isis with her faithful robot, falls tragically in love with an arrival from earth who is unaware that her natural form has been hidden in a humanlike space suit.
(summary from another edition)
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