Chaos and My Dear Aberthade

On an Alien planet, locked in a room where the only door that leads to the outside world would kill her if she touches it, an immortal woman, who had the appearance of an angel, lived for billions of years alone. Experimented on by the natives of the planet for as long as she can remember, she doesn't know who she can trust completely, but she believes that one day she could leave this world behind. Suddenly, she gets swept up in a romance and just a few months after she marries a man she believed was kind, he leaves her while she is pregnant. Then just as suddenly, after their child turns 3, she is left completely alone for a hundred years only to have a group of young native species come to her door. What do they want with her and why do they look like they've lived through a war?

First book in: The Shards of Ruiel Series.