Stay as calm as you can be if you do get the opportunity to speak to the OW. The calmer you are, the better because you aren't giving her your power!
I can now laugh about the time I confronted the ow on her job at the hospital. She was a transcriber for the doctors in the cardiac unit. She never saw me coming and when I left her, she had her head in her hands the patients were clapping for what I had done. My xh never said one word to me about her and he knew better.
Hang in there and I'm praying that everything falls into place for you and God gives you the strength to listen and tell her what is on your mind.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.