Sounds like a good night. I wonder what she was pondering while you drove to her parents. Maybe that is a recipe for you - let her be quiet around you for a while and then she will open up after collecting her thoughts. Too bad that she drank too much and might forget all the good conversation.
I cant help but get a chuckle out of the "Old Cougar" nickname. Just make sure that you dont accidently let it slip out of your mouth as a sarcastic remark in a future conversation.
I yearn for the day when I can go out to dinner with W and no kids. So far in the last 2 months, W and I have done lunch twice. For the time being, OM is getting most of the dinner dates, but that may be changing soon if she moves out to an apartment.