Actually she wants him dead or removed from crown prince position so her child can be crowned
Not at all, she makes it very clear she doesn't care about any position. If you actually kept up with reading, you would know all of this started with her obsession with lee nok's mother's face which she never got over with, and now with lee nok's face who looks exactly like her.
She has clearly said it's not her intention. And that she doesn't care about the position of her son at all.
How about her wanting to take his body for herself? I mean to occupy it? Or plant another ghost in it?
Actually she doesn't care about her son anymore.
I remember reading that she wants to use lee nok as a vessel for her, don't remember the exact words though
Exactly, I've reread it not long ago and there was "a vessel" but she didn't specify for who, whom or what. That's why I've started to wonder if she want's to plant smth or someone in Nok's body. Maybe her dead lover?;) But I doubt she's able to have some like that.
Imagine if the evil step mother found out about plastic surgery,,,,all that just cause she wants lee nok's face bruh