Ok, Since I am almost reaching chapter 57 (the last one I have available now) I will put a theory here that maybe can be revealed in the next chapters, so don't confirm it if you know it already.
Based on what those evil spirits said, it's possible that she is alive.
Also, she has a literal evil eyes since she was born.
And to add all that, I felt her parents act really weird when he was looking about her. I mean, if your daughter died 2 years ago and then an old friend came looking for her, you would not be happily dancing shortly after he leaves, it's sounded that they didn't have any shred of grief.
Thus, I think she is in coma and her parents faked her death, and they have some relation with this evil eye.