I love my mother, but I know we will have it out.
It might not happen. I can only talk from the way I've sometimes gone about handling my own issues, I've found that if you go in expecting bad to happen then it has more chance of happening because you're already on the defensive and they've more chance of picking up the 'vibes'
Whether it does or doesn't happen, just stay cool and take lots of deep breaths!
If you do end up having it out with her, I hope she goes for option B!
Hope all goes well. Let us know.