Well...it probably will go well, and she will probably be open for that convo over dinner. Take things as they come.
One thing though, I noticed you used the word "avoid"...so I'm going to use it myself.....don't avoid this conversation for very long. It needs to happen, you will most likely be the one to instigate it. I completely understand wanting to enjoy the evening with your W...just make sure you don't put the conversation off for too long k? Too many people fall into the trap where they have a fun evening...so they wait awhile to bring things up, then they think they've waited too long so they'd look like a fool now if they did. Know what I mean?