Yes, we have a history of things where she expects to be involved in everything and centered. She will say things like, "I was at your child's birth!" The subtext being, "I'm such a good, supportive mother I went out of my way and came to support you when you gave birth!" The reality is that she invited herself and came without being invited, when I told her I wanted it to be just me and my husband. To this day, I regret that I didn't tell her to leave. I did for my second birth, as I wasn't taken by surprise, and the tantrum on her part wasn't pretty. So this is what I base my statement that there is no point trying to communicate my side of things to her. She has her own reality.
If it comes up more naturally, I will be more explicit about what it was that finally flipped the switch for me. Factually though, not up for discussion.
I just want to make this as painless as possible for everyone. It's not an easy transition. Your support helps. Thank you.