Why on Earth has Kareena Started hating Preeta yet AGAIN?

I mean in the middle she had started to acknowledge Preeta and her efforts to do the best possible for the Luthra family- she saved them from all troubles including saving Karan and Rishabh from jail and everything and now yet again she starts blaming Preeta for Rishabh getting arrested? WHY? Honestly what does she get out of insulting Preeta soo much? How does she sooo easily manage to forget all that Preeta has done for her and her family and majority of the time she has gone out of her way to defend Karan and Rishabh! This is very nerve-wracking now! 😡 😡