Is it normal to constantly be annoyed by your friend?

I have a friend, who I was very close with and I have now drifted from. We drifted as a result of her changing who she was, becoming self-absorbed and attention seeking. This has not gone unnoticed by my other friends either, who share the same feelings. Now, every single thing she does absolutely annoys me and I hate this, but she continues to give me more reasons to become annoyed or offended. I'm struggling to even pretend anymore, is this normal? What do I do?