She does know that her father was involved (not sure if Manhwa has made that explicit yet), but didn't know what was going to happen nor had any hand in it. The church and her father are 100% to blame. She also was rude to Shuli, but there's reason from her perspective for it, because of the way her mother was treated by her father since he favored his mistress, the fact there were rumors of Jeremy and Shuli being romantically involved or at least feelings towards one another, how she acted towards Shuli stemmed all from the aspect of her father and his mistress and her mother.... it's really sad tbh. Doesn't mean it's ok what she did, but she's not some cruel heartless murdering wicked woman you know?