So, taking into consideration that last few scenes : Raeliana from the first time line realized that she was being poisoned, but kept it secret and kept drinking the tea?
The scene of Beatrice laughing while climbing the stairs bothers me...
One thing I suspected was the current Beatrice is old Raeliana, who placed her soul in Beatrice's body... which could explain the current Beatrice desperation to kill the current Raeliana: they both can't exist on the same plane...