Hi T. I hesitate to offer too much advice here because only the Lord knows what's happening in my world. That said, I'm not sure how defending your boundary is a bad thing. She certainly doesn't like it and your analysis of her self-focused behavior seems right on to me. I think that your next move is to enjoy your kids for the next 2 weeks. You have shown that you aren't going to be bullied or pushed around and you did it without drama. Basically, you behaved like a mature adult. I'm not sure how any other option gains you anything.
You are in what my C calls the work phase. Others call it the grind. When you just have to take right action and trust that the outcome will be the best possible outcome though perhaps not the desired one.
