She is the only human in an intergallactic convoy of aliens. They kidnapped her in their convoy but thanks to her unique skills she quickly became a special agent working for the convoy. The main goal of this convoy is to visit every planet and take everytthing on it (natural ressources, cultures, inventions...).
However the only reason she stays in this convoy is because she wants to find other humans like her. The fact that she's human is a great advantage because aliens can not read her mind.