
Hmmm I think I get it now. Old Raeliana must've swapped souls with Beatrice out of jealousy because she saw what her life would become with the dark fortune teller while Beatrice was happy BUT- and now I'm getting meta here- because of the rules of isekai Korean now Raeliana was supposed to become Beatrice. So something happened and Raeliana went into Beatrice and Korean MC went into Raeliana's body when she was supposed to have died. Plus if anyone found out that Now Beatrice used dark magic she's dead meat that's why she is trying to kill her.
TEACH THEM WHEN THEY ARE YOUNG!