Mistress Darcy wrote:
It really isn't just her fault though. I know you don't want to hear that, but if no one has ever said no to her she probably doesn't even realize she is being selfish. Your dad needs to set boundaries and stick to them. He is just as much responsible for the current situation as she is. That being said, she sounds really crazy and child-like. 
Oh no, i completely agree and i've told all this to my Dad. She's been spoiled soooo long by everybody, it's difficult for her not to be the center of the the universe anymore and it's a shock to her system to be declined or to be stood up to. 

Well, i've been sleeping very well since i decided to ignore her, that's what a clear conscience can do. She insulted me and my family and she does not think that's wrong. My father may be hard up about staying close to her BUT i refuse to continue having a relationship with someone who is so vexatious and unbelievably toxic. Thank God she lives out of town. All this makes me relieved that even though  i am poor, i am mentally stable. Very much better  than being rich and undeniably crazy, .