She's not over OM yet. If OM gives her half a chance (and maybe even if he doesn't) I think she'll continue the A and just get more sneaky. I don't say this to hurt you more, but to hopefully keep you on your toes. I can tell you that when my H confronted me that I was no where ready to give up OM or to work on the M.
I think your W was too far gone when she was busted...to stop the A that easily/quickly...without trying to do it again and not get caught the second time around.
I think this is dead on. This is exactly what happened in my sitch. W was busted, and said she wanted to work things out, but without any boundaries with consequences and no transparency, she just continued it secretly for 3 more months behind my back. I'm not 100% sure that even the transparency would have worked, as she used a "secret phone" that I discovered later.
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