You are definitely in a tough spot. On one hand, you may be correct. She may just be cake eating. On the other, she may really be second guessing herself. If she is cake eating, then declining her offer to have a dinner 'date' was the right move. On the other, if she was really having second thoughts, it could have been a chance to have a nice friendly evening together.
From my experience, you probably did the right thing. Months after my W and I separated (we were living in separate towns) we had a few date nights. These nights things seemed like we were back to our best of times together. But even though these nights were really nice, and 'felt' good, the truth remained there was a lot of distance between where we used to be and where we were then. Those nights may have served as a reminder to her, and me, of how things used to be. But until the underlying issues in our M were addressed, they were really nothing more than a brief emotional timeout.
I hope some others with experience chime in soon with their thoughts for you.
Me: 42 W: 32 Married 7 years together 8.5 S1: 7 S2:7 Bomb #1: 09-16-13 Recon #1: 11/13 A discovered 04-03-2014 W filed D 05-19-14 but never served me I filed D 12-02-2014 S 05-31-14 Divorced 5-19-16