Soldierdad, if she starts being nice and sweet, DONT fall for it! If she wants to come back, the two of you are going to need some major work on your marriage before it will be safe.
You seem to know that you are in danger of rushing into her if she tries to be nice, so be careful not to.
Keep up with the boundaries, keep your boys taken care of, and keep doing what works, and keep yourself from mindreading.
I guess I gave the wrong finger to the wrong man...