I believe you have a wise idea of just listening alot.
If I ever get the chance, I will be doing the same thing. I, too, have a gut feeling that that day will come, but in reality I don't think it will be anytime soon..maybe months/years down the road. But something, I don't know what, is telling me it will be sooner than I think.
Also wise is your decision not to say anymore to OW. You're correct..you've said all that you felt you needed to say, and its wise not to feed her anymore. Its time she doesn't have you or your husband to use as a crutch, and stands on her own two feet. She deserves to love and be loved, just like the rest of us, but God will have someone else in mind for her. Someone that will truly be able to give all of themself to her. Not someone that is using her to help themself through a life change they find difficult.
Now that the conversation is over and done with, don't let her bait you into more. It really bothers me that she asked if she could talk to you more. There's something that doesn't ring right about that...not at all. Please be prepared for possible fallout from the conversation.
Zip the Lip is a phrase used on another site quite a bit, and it's something I'm still trying to perfect myself. I think it's very, VERY wise advice from a person that's been there herself and has had a very longstanding restored marriage.
Women are angels. And when someone breaks our wings, we simply continue to fly...on a broomstick. We are flexible