well, this is only my opinion:
when Priscilla first Awakened (after she killed Teresa), she seems just as mature, cruel, ruthless, cold, and such then as now in chapters ~100-103. (though we don't really get shown much, as it is brief, Irene, Sophia, and Noel attacks, and then Priscilla flies away, leaving Sophia and Noel dead, and Irene almost dead).
obviously, in between Priscilla has undergone some changes. well, just after she fought Isley and her time with Raki. She was in her amnesia child-regression mental state. (she had shrunk in size during time too due to Raki keeping her from eating humans' guts for the ~7 years they are together).