Since you've been dark, she may have sent that text to make her feel like she's regained control of the situation. Or she may be temporarily mad and wanted to say it for the effect.
Heck, my wife "divorced me" dozens of times over the year we were separated. Once that cat is out of the bag, it doesn't hurt as much anymore, but for the person saying it, they think they are getting in a dig and taking control of the sitch.
I know it's hard, but from someone that's been through it, just appear to be indifferent about it. I wouldn't ask her to meet, I wouldn't even really respond with lengthy messages. Just say "ok" and nothing else. Be mysterious.
And at the end of the day, if the dissolution actually does go through, so what? It doesn't mean you can find your way back together in the future. Since there are children involved, she will still be in your life in some capacity for quite a while.
I'm amazed she's agreeing to a dissolution. Quick, low costs, and you won't have to give her anything. That is quite amazing and kind of makes me thing she's not really serious about following through.
Me: 43 W: 37 Together: 18 M: 15 D: 8 yrs old ILYBNILWY: March 2011 She Filed for D: August 2011 She moved out: Sept 1, 2011 Reconciled: May 2012 Divorce Case dropped: July 2012