Well that's good to hear you've got the girls for a couple of days. That should bring some joy to your heart.
As far as 'just' chatting with her if she wants, I think part of DBing is not being available all the time. It's a tough one, I know, but she needs to get the feeling of what life will be like without having you to lean on especially since she's the one so keen on divorce. Also, you can't guarantee there won't be a fight. I'd pace myself, but that's me. Hopefully a vet will chime in on this.
As for the finances, she may get a surprise and be told by the mediator that she will have to pay you spousal support - I don't know if she knows that yet, and if she doesn't that probably won't sit well. I know it didn't for me when I was told of that prospect, however, I was the one getting dumped and that just added salt to a very open ugly gash in my heart. Talk about OUCH!! Turns out I didn't have to do that, thank goodness. And my H, being a very prideful 'man' as well, probably wouldn't have agreed to it. (The 'man' thing is just cuz I'm finally a bit angry with him right now - will be journaled on my post site some time tonight)But back to you. So I wonder how much she's willing to chance knowing that is a possibility.
I'd say play a little hard to get unless the conversation is something important like the girls, fianances, health issues, or your marriage/divorce - basically business. Not chatting just to chat IMHO.
Me 59 H47 M12 T22 No kids BD&S Apr 2,2013 - ILYBINILWY Filed 2/12/14 OW 11/13 The Universe always strikes you at your weakest point because that’s what most needs strengthening." – Joseph Campbell