hate to be the wet blanket, but I wouldn't be celebrating yet. Your W isn't coming back right now. It's customary for the WAS to have what they call "false starts". You are right that she probably is just feeling low because of the OM, however, because she hasn't done any work on herself, she will leave you again the next time another guy comes along.
The only way that you can tell when a WAS is slowly coming back is when 1) they apologize and UNDERSTAND what they did, 2) they tell LBS that they want to do the work and PROACTIVELY go to MC and IC, 3) are completely transparent to the LBS.
Too many times I've seen posters who have been in your shoes who have been just so happy to have their spouse back, that they ignore everything else. As a matter of fact, there is a poster just last week who came back to say that their W just left again because of this.
Don't sweep things under the rug. Tell her what needs to happen in order to reconcile.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.