First off, I would stop "wondering" why she's doing what she's doing. It'll drive you nuts.
Just do your own thing, don't let her shifting moods and actions affect you. The next time she's doing physical stuff like that, don't actually engage. Think of her as you would a good friend.
UNLESS you want to start actively flirting with her and see if she pursues.
Bottom line is. You start driving the train instead of letting her steer your actions. Do what YOU want to do. Not what she wants to or how you feel she wants you to act.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.