Hi Anrea,
I agree with TishaBuv that this person sounds very extreme. Twelve hours a day conversations, every day? I have not heard of anything this extreme before. And if she is filled with anger, and even hate, towards whole groups of people? I think you are wise cutting off this friendship. I too feel uncomfortable if I hurt someone's feelings and I dislike cutting someone out of my life who might be hurt by that. I will do so if necessary though. I think you did the ''right'' thing ending this friendship. I hope you're okay now?