Beyoncé is clearly not of the world that you and I live in—I think we've already established that. But if you require further explanation, here's a video from the Summer & Eve comedy team, with some stone cold facts to back up why Mother is an alien (which, again, has been confirmed). Exhibit B: "Her waist to hip ratio is extraterrestrial/ Her body, face and arms and legs are super celestial/ Beyoncé is not a human, no way." Makes sense.
Here is an image of said subject on her home planet: