Miyabi: Depends on your personal point of view really. Of our family, she was the one who wasn't into your grandmother's idea of having humans and Mamono together. Even kidnapped her once just so she could rip her wings and tail off.
Miyabi: The issue your mother had with us is the whole rape context being one of her buttons. Of course, how is it our fault when the Chief Goddess was that one who stopped our mother from completing the Mamono so that they wouldn't have that issue? The only thing we wanted were to live with humans peacefully without all this gratutious violence and wanting to wipe out other species like way back then. That sort of reasoning to keep the Mamono as being carnivorous and brutal predators to humans was their idea. And if you want to talk to the Chief Goddess to get her side of the story, you're free to do so.
Miyabi: Well, Mamono used to be killers, but our mother didn't like that and wanted to change things for the better of our kind and the humans. The Chief Goddess didn't like that and wanted to continue the killing of both sides, making her trying to reverse the changes. That led to the Mamono taking people just to have sex regardless of consent.
Miyabi: Yes. But if you don't want to hear how all this metaphysical tug-of-war made your mother join the Order, you wouldn't understand why she's pretty much in my point of view an abrasive fratricidal bitch.