I am so happy for you that you finally got back into your house I know it must be hard right now.
Now you need to make all those changes to the house that you spoke of doing for YOU. Focus on that. Make that house into the home that YOU want for YOU and S6.
XW will one day see what she is missing out on with you and S6. But SHE has to be the one to realize that. You cannot make her wake up to it. Keep moving on with making YOU and S6 top priority and being happy with that.
Just wait until the "new" wears off on her new condo. She is no longer in her "comfortable" place (your house) and she now may eventually have to sit down and take a good hard look at where she is and what she has done.
Don't let her anger get to you. Stay upbeat around her no matter what. Do not allow yourself to be drug down by her and her remarks, actions, etc. You are too good for that
Keep hanging in there. You know where I am if you need me