After reread again from chap 1. I have wild guess that actually the real Raeliana is in Beatrice body, bc she was visited the fortune teller she knew what would happen to her in the future, and involved with black mage to switch her soul with Beatrice, and then plan to kill her. And then she come back and playing a hero to find the truth about her friend, but instead Beatrice become her, it's another soul from other world enter her old body.
Well.. just wild guess.