Stasis

Two hundred years ago, Iris uploaded her consciousness into her ship's computer and fled a dying Earth with a handful of survivors. Now she keeps the ship on course and running smoothly as a bodiless artificial intelligence, knowing that nothing less than the survival of the human race is at stake. Danna remembers being Iris. She remembers planning her mission, and uploading her mind to the very ship she's a lowly worker in now.
But she's learned some things since then. And she knows that two hundred years ago, she made a terrible mistake. Now all she has to do is make the ship's AI-her former self-believe her. This short story is 3900 words long. It is also available in Digital Soul, a science fiction short story collection.