I have brother like that. Avoid her but be civil when you see her. Barely civil.
give her a piece of your mind, and then move on, who needs a sister like that.!
I feel the same way about my sister. She is nothing but a whiner and complainer and I am tired of her.
Then just let her be. Dont beat yourself up for your choice..find peace in your realization that you are better off.
so sad ? how can i help u