Don't assume it is easy for her. I thought it was easy for my WAS, until I saw her. She lost 10% of her body weight very quickly, and is still struggling with her decision.
It may be she doesn't want to see you because it is a reminder that the decision hurt someone deeply and/or you remind her of the good times you had. There is no way to know.
I understand the hurt and pain. I understand the wanting to understand. But from the sounds of your conversation with her, I think your W needs space. I know it's hard, but don't initiate conversation with her. Let her do the talking. Anything from you right now is pressure. Reduce the pressure and see what happens.
me: 45 W:45 M 20 years T 22 years S14, S13, S11, D9 BD 2/28/14 D papers served 3/3/14 I moved out 3/15/14 MC start 4/2/14 I moved in 6/2/14 D suit withdrawn 6/30/14