Remnant population - Elizabeth Moon

People had always told Ofelia what to do; for once she was going to do what she wanted. She refused to get on the cryo ships, refused to leave the only world she could call home. And when they finally came for her, she hid.

Now the widow Ofelia is alone, the only remaining settler on an abandoned planet.

Then new settlers arrive. At first she fears they have come to reoccupy the settlement she has come to think of as hers - but they land far away. And as Ofelia secretly listens, they are slaughtered to the last child by stone-age aliens no one knew were there.Now it is up to Ofelia to save the aliens from Earth's wrath ...

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