Spoiler......
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Well actually it's kind of true. The real Raeliana is actually Beatrice. She switched her bodies and changed the future. She was in love with the ML and didn't believe it was fair how she would die. She saw her future and the future Raeliana would have and thought..... why not just switch bodies with my best friend who moved away? I know she wouldnt give any fucks. And bippity boppity boo, there's how everything is now. There may be some other stuff to go into details about, like who did it and stuff but that's basically confirming it and why she did it.

Let’s be honest, I’ve suspected (maybe a spoiler)
that mc is actually the Beatrice and that somehow the “original” brunette somehow traded bodies with the dark magic thing that mc was trying to find in earlier chapters.