AITA for confirming my MIL's suspicion that I didn't want her in the kitchen while I cooked?

Apparently I am still in her doghouse for this, so I wanted an outside opinion.

My MIL is not a bad person, but she can be very difficult. My wife, "Sarah", has learned to process these things with grace, which I appreciate. I am still learning but I will get there, I hope.

One of the ways she's difficult is that she has some manipulative tendencies. A very common tactic for her is to "fake"-whine that she's not welcome here! I guess I'll just go outside! With the obvious implication that we need to comfort her and tell her that she is welcome.

(I suspect she has some abandonment issues. IANAtherapist.)

Again, my wife has learned to deal with this over her lifetime. It's "just the way mom is". Which is fine! I hate it and it is manipulative garbage, but I might do the same thing.

My wife and I bought our first home last year so we hosted Christmas. This is MIL's first time being a guest instead of the host, so I knew we'd need to be patient with her. She's out of control of the situation, that's hard.

Well, it was Christmas dinner cooking time. Our kitchen can be generously referred to as efficient, and I was cooking for 12 people while Sarah played host. And my MIL found every excuse to park herself in my way as I was trying to roast a goose and make five sides. I had to ask her several times to move just to find space to chop.

Finally, this exchange (recalled as exactly as I can) occurred:

me: hey mom, you can just go hang in the living room with everyone else. I got this!

her: oh I get it, I'm not welcome here! [imagine this in "fake" drama tone]

me: well, yeah, but I figured it would be rude to say it like that.

I think she was mad I didn't play along, because the facade dropped instantly. she said "fine" and went back to the other group. I didn't think much of it until she told Sarah this week that she was still mad at me.

AITA?