My theory of her being an Alien is becoming stronger. Ever since the first chapter when Nasa kept talking about Kaguya-hime and the Moon. Then apparently, a Moonstone keeps her calm. Then she can read a different language (at least I'm assuming it's a different language. Though, It may be just from an old Japan period). And If she is an Alien, that would also explain why the author named the MC after America's space administration.