Dog training 101 - reward the good behaviors, ignore the bad ones.
Even though you obviously will feel guarded and skeptical - I certainly would - you still want to reward the good behaviors.
It's not easy, keeping your guard up without letting it appear to be up.
My guess is listening to her coworker reminded her what it was like in the early days of your marriage. Maybe she was just finally ready.
OR - maybe she's concocted a plan to kill you in your sleep and wants to throw you off her tracks. (Just kidding.)
Even if she was sincere (and she probably was) she may not be fully baked yet and may come back from her business trip in a completely different frame of mind, so be prepared for anything.
