Dawn (Xenogenesis, Bk. 1)

Lilith lyapo awoke from a centuries-long sleep to find herself aboard the vast spaceship of the Oankali. Creatures covered in writhing tentacles, the Oankali had saved every surviving human from a dying, ruined Earth. They healed the planet, cured cancer, increased strength, and were now ready to help Lilith lead her people back to Earth--but for a price.