Your W will NEVER be interested in you as long as she is with OM.
The best gift you can give yourself and your daughter at this time is to work on you. Work on controlling your emotions and work on controlling your highly reactive behavior.
The only way to work on your issues is to remove yourself from this volatile situation. The constant thoughts of OM and your W do nothing more than fuel your reactive behavior and your desire to pursue.
Stop using your daughter as a pawn. It is unfair and cruel. As you can see by reading thousands of other situations often times the idea of a destroyed family, children, illness, death or any other major life force still is not powerful enough to bring back a WAS.