FIB, I agree witht the others, she is acting like a teenager - including the whole, the world revolves around them attitude.
I have a teenager and when this happens, I have learned to say nothing and walk away. Anything else involves an argument and saying things we both regret.
I think it is better for you not to have any conversation between you.
FIB, this has been a long, winding road. I hope at the end of it, you find the rainbow.