You are trying to make too much out of it. Look, you stood up to her and she treated you a lot nicer........and that's all it is. Trust me, it will not last b/c she will test you to see if you will be her doormat or not. And it will throw you for a loop b/c you are already confused and wondering if this is her trying. No, it is not her trying. But you see how she does know how to act nice!
This is exactly how my H would act. I had to be cold to him b/c if I ever smiled or said a kind word, he thought we were on our way to reconciling. I could see it in his face! She will not be so nice if you let down your guard and give her the impression you are wondering if this is a positive step. Big mistake!
You spoke words to her..... about her needing to give you respect. But the test is coming. Don't be confused. Don't be taken off guard. Be ready.
You can do this!
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!