She was nasty to you before, now she is nice. this is the crazymaking shit they pull to keep you so 'on your toes' that you are unable to function in your own life.
She has conditioned you to be solely focussed on HER mood as YOUR indicator for your own. It doesn't matter how you feel, only how she does. If you wake up full of the joys of spring and she wakes up in a fug, YOU need to be in that fug, or else.
You need to take further control of your life and see that your feelings are valid, your decisions and choices too. You have your boundaries respected by those that love you and want the best for you.
she doesn't respect you, or your boundaries because, to her, you are not important. Only for what you do for her. It's not even about YOU doing this stuff, it's the fact that she needs attention to feel alive, and she will demand it from wherever she can get it, and whoever is daft enough to provide it.
You can't see a way out of this on your own, because this mess is all you have ever known.
your DP knows different, we (although may have experienced similar) are NOT conditioned by her so her poison doesn't work on us...