"but you don't want you to misinterpret your niceness."
I meant to say that you don't want her to misinterpret your niceness. Just as you can't get all excited if she is polite and nice to you.
A lot of LBH's take a one-time act of niceness from the WAW as some kind of sign that she's ready to reconcile. But then they get knocked back down when they see she's not ready at all. So, take it for what it is. If she's talkative one day, that's fine, but don't take it as a "sign". If she's being nice, good, but remember it is what it is, and nothing more.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!