I think i know what's happening. I think that body is her real body. To protect her or something Yarn send her soul into a human body and a human soul into her body. That would explain why 'Leah Blessa' couldn't use magic but mc can. I think magic there is provide by the soul.
Everyone in her situation will feel uncomfortable but this isn't a reason to act like a witch in the following chapters.
where i can read the following chapters plz ?