The drinking, OM, etc, are all part of the distraction. She's unhappy and uses these things to not have to face the reality that she is unhappy. She's lost and will ultimately find her way, whether it's all the way back to you is up to you. The amount of time it takes may take longer than you are willing to wait, and the damage done to you may too great, but if you are aware of the progression, it could help you hold out. In the end, it will be your choice as to whether you want a relationship with her or not.
M:39 W:37 Together: 16 years Married: 11 years Bomb: May '09 (ILYBNILWY) Moved out: Nov '09 D: 10, 8, 4