You are doing very well in listening and validating department. She really is all over the place, but at least she's not mentioning the divorce right now.

Yes, they do tend to get forgetful because they have too much going on in their brains and that also could be part of the depression too.

So, if the kids are w/her some this weekend...then what are your plans while they are w/their mother?

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.