In their mind EVERYTHING you do is an attack. Even being nice and acomidating. All you can do is your best and detach from her as much as you can.
For now, your role in her fantasy play is that of evil villan. She needs that to justify her behavior. Try your best to stay off the stage.
This is the part I don't get. My H is doing the same thing - assuming that everything wrong in his life is my fault. I had no idea I was such an evil mastermind! So how to stay off the stage? Just validate and end the conversation?