Correction: She's IS a child, who got memories of a novel she read in her past life n that's it. She has no idea of who or what she was in her past life, she's just a child who knows the story set in their world. So what I'm tryna say is she is not 'acting' but is a child.
she was reincarnated but acting like a child than her real age LMAO. But this slow-paced storyenjoyable, it's a very cute story.