That's actually supported by how, relatively, much screen time she had and also the close shots showing that cunning smile. Not to mention much of the authority indeed seemed to rest on her. If she belonged to some human faction that had an access to old knowledge, unlike Gargantia, it would be far more plausible. Thus, she would know all about what happened between Evolvers and the rest and how a chunk of humans escaped to the depths of space.