Raws so u can check for yourself
https://toonkor.haus/어느-날-공주가-되어버렸다
Kinda off but I can tell you what happened!
Claude was like "yeah i need to kill you so my mind will be at ease because looking at u gives me suffocating feels >:(" Athy was thinking to herself that it was basically her fault that her dad got hurt trying to protect her since she can't control her magic, and she doesn't want to die by his hands.
The flashback was just her thoughts on Claude, on how even until now she still thinks of him as her dad. So she was like, "Goodbye, papa" and promptly uses her magic to disappear in front of him. Dumbstruck, he just watches her go before getting emotional. He started yelling how she just disappeared in front of her and he refuses to think she's gone so he ordered everyone to find her pronto. :v
Meanwhile the fruit Lucas is lookin' for is a no show. He keeps kicking the world? tree and that's the reason why it's raining all over the continent lol.
As for Athy, she's hiding in Jennette's room. u:
MAJOR SPOILERS CHAPTER 54
So I don’t know exactly what happened because I can’t read Korean but in chapter 54 the dad goes to her and they start fighting with magic and eventually his spell overpowers hers and she completely disappears all whilst crying and saying what I can only imagine to be a really emotional goodbye. It shows pics of her past life so maybe she was transported back? Idk it ended there but then it kinda looks like he gets his memories back and yells about being the stupid idiot he is idk, I’m scared and I hope she’s not dead. Oh dear god don’t be dead Σ(っ°Д °;)っ