What sets it off is her thinking about the nice time it was. What sets her off inside is her own inner conflict about whether to stay or go, whether she wants to be married or not. The "appearance" she put forward was the catalyst for her to think hard.
Do not ask about it. Say Nothing. It's all normal. It's ok for her to think about what she is doing, and if she thinks she will be bothered by it. But you are not bothered. Act "as if." You are cool. You're fine with her moods. This is the test for you. "Will he stay in control even if I am moody?"
I don't really believe they consciously ask that question, but still - they implicitly ask the question by the way they act, and they truly do want to learn the answer, if you know what I mean. Regardless what happens later, if you are solid now, then in the future she will look back on this time and see "oh, wow, he was a rock the entire time. Just a solid rock in that stormy time." That is what most women want. Even if she is not responding to you outwardly, she is learning that you are reliable and solid. There's no guarantee that if you are a rock she will come back, but the chances are much better.
It's cool to say "I had a nice weekend with you." But I wouldn't say, "Thanks for the nice weekend." Did she give you a nice weekend? Or did you make it a point to have a nice weekend with her? There's a difference. One says you are in control of your feelings, another says someone else is in control. Remember, the error that many of these WAW's have is "he doesn't MAKE me happy." Well, yeah. No one can MAKE anyone happy. YOU make you happy, and SHE makes herself happy.
Now that she has pushed away, be prepared for a long lull. Quiet time. Nothing much of anything. Now is when you remember back to the other night and just enjoy that in your mind again. Just wait it out. Be positive. No R talk. No questions.
It would be ok to say "oh, you're looking better today than you were last night. I was worried about you, you looked tense." But keep it light. not too deep.
