AFWAW, Steady and don't think anything of this...do not believe a single thing she tells you. Actions speak louder than words. Always remember that your in-laws will side with your W when it comes down to the wire...but, if you can use them then do so. I thought they already knew what was going on...part of your exposure plan is to notify anyone who will influence your wifes actions...your job is not to make this easier for her. Again, do not worry about her getting angry, your marriage will survive her anger not the affair. She has to realize that this affair is just a fantasy that has nothing to do with real life...all they know is going out to eat, parties, social events, etc...they do not have the stress of bills, work, sick kids, deployments, house repairs, etc.
Great idea on having fun with your daughter tonight...now just go do it. If she calls on your daughters cell and ask to talk to you do so...and tell her calmly to stop putting your daughter in the middle...when she is ready to talk marriage you are ready and if she wants to talk divorce you will have the lawyer contact her.
No more playing games and letting her yank your chain, Stay calm and professional, loving to your daughter, and take care of yourself. Maintain your holding pattern for now. You might as well chuckle and enjoy the weekend.