This is going to be your show, LR... If you expect your W to open up, you might be disappointed. She might be thinking there's some "bomb" in your desire to talk.
So I'd recommend that IF you go through with this messenger chat, know exactly what you want to say and how you're planning on closing.
She may not be receptive to ANY "nice" conversation you might want to have...
AND... understand that I have tried to set up little meeting to "test" back in the day when I was still not following DB and they failed to happen, even though my W agreed. And you'll see this occur on others, just recently...
She may bail on you, last minute... you have to be ready to accept that, just as you didn't anticipate no response to your initial text earlier...