I got the sense a long time ago that because she was being nice and not pushing her lawyer you thought that she was changing her mind. I knew that most likely she was saving up money for her post D life.
At the time of the filing you should have sat down and discussed how you were going to handle the monthly expenses moving forward.
I think your move now is to come to an agreement and move forward with your lawyers/mediation.
If you are selling the house start getting it ready to hit the market.