Sounds like your W was getting comfortable and enjoying herself a bit too much at the local bistro. When she realized that her walls had come down a bit, she backed up and put them up once again. When she is like that, just leave her be and go on about your business, i.e., just as you did.
I think you handled her visit quite well. She senses that you are moving on, i.e., especially if she noticed the pictures were taken down. The wedding dress may have been on her mind. They have plenty of time to think of things and sometimes, they ask about some of the oddest things, things that do not pertain to the here and now.
Continue as you have been. Keep the focus on you and your children.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
