Okay so up to this point I felt sorry for Zenon because based on her quotes she was a unloved person that was always alone with everyone trying to kill her. But then she ate Taro and Hanako WHY!? Is it because she finally snapped after the person her current incarnation loved killed her or was it because she was always a psycho bitch.
cut off all ties to any loved ones in a sense, that and not that she got full control over adell, he was fighting back somewhat in his mind and on the outside was the produced conflict of insanity. Once control is gained she will probably leave for a different world again.