You'll get many opinions from the posters here but when it's all said and done do what works for you. We all give advice/solutions based on what "WE" would do. Now i'm a BIG proponent of leading with love. Christ commands that of me as my W husband. Which is why I don't subscribe to the theory of the M being over at BD. Maybe one party ended it but we both took vows before God not just each other so my commitment to honor God takes precedence over ALL. Secondly, "i've" never believed in putting your head in the sand makes anything disappear. I'd confront her, will that make her leave or push further away? Who knows and frankly, you can't let the fear of her leaving control you in that aspect. Truth of the matter is you can NOT mention it and she could still leave without ever returning. Never underestimate the power of exposure.
Now I don't believe you do it as a tactic, I simply believe that behavior of that nature needs to be confronted. Passivity can be a dangerous thing. Speak up, with love... And after that let it go. That's just "MY" take and that might not line up with DBing, as always eat the meat and throw away the bone.