I think it is very easy when one is not happy in one's M, to think back to prior R's and suddenly see them through rose tinted glasses and perhaps feel there was unfinished business. Your W went back and tried that and found out it was wrong, and what she already had was better.
However, it doesn't seem like you know WHY she felt the need to do that....or do you? That is the thing that would be important to me, because that's the emotion/ feeling you need to be working on.
What made your W want to look elsewhere? Now in my own M I know what went wrong and so my H and I guard against it happening again.
Have you read The Passionate Marriage? If not, I would recommend trying it.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength
