It might not even be that shes enjoying the OP that much, shes just enjoying not having to feel guilty!
My W told me almost this very thing several weekends ago. She said that she had to leave to get away from the guilt. I agree that once her A is finally over and the fog clears, having to process all that guilt will be VERY difficult.
Me 45 WAW 36 S8 T 15 M 12 Multiple PA's since 6/07 W moved out 10/25/09 I filed D 12/29/09 Sitch