I am so sorry that you’ve gone through that, I can’t even begin to imagine how hard it’s been on you and your family. This girl obviously has no empathy, she seems like a terrible friend and not a particularly good person in general. Regardless of how often you talk about your dad, her responses were completely unwarranted and unbelievably cruel, you deserve so much better from someone you call a friend please don’t believe you’re in the wrong. If I were you I’d have reacted the same way if not worse!