what we are all assuming(from the comments), beatrice is also from another world and knows what's going on. So she is trying to make things according to the book again ( where Raeliana died and Noah fell in love with beatrice).
That's why she wants Raeliana dead soon.
Spoiler
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This is an explanation of one user who had access to raws/friend who reads in advance.
Actually, the one who is inside Beatrice is original Raeliana, Raeliana should be the reincarnation of Beatrice but a witch switch them.
*i got this explanation from my friend
OMGGG
then what will happen now??
my head is spinning now
BITCH WHATTTT OMGGGHVDKJHASGKFDHAS
makes more sense why her soul won't Intergrate with the body after so long
I knew it! (๑•ㅂ•)و✧
Right!
Instead on reincarnating into the main heroine, because of an unknown person and black magic, was put into someone who should have died.
(⊙…⊙ )
And I also think that Realina's soul right now is not compatible with her body.. She is from the future, and she is Beatrice's reincarnation.. So maybe there really is a chance of reject...
can y'all tell me spoilers about Beatrice