I think what you need to do in this situation is TAKE ACTION! The next time you see/talk to her, as long as you're up to it,
tell her you're taking her to (certain place for a date) at (time), and that she should get ready for a very fun time, or something like that.
Basically, don't give her a chance to use her "game" and confuse you. If you let her know your plans before she has a chance to do anything, you have the upper hand in the situation IMO.
There is a girl I like now. I'm being myself around her which is good, but she can get into my head at times like no other girl I've knows (seemingly she could read me a little bit). She even had this little smirk like she knows she can read me at times (and I don't think I'm all that predictable).

To prevent this from really getting to me, I caught her attention one day and then told her I was taking her to coffee this week at (time/day/place) and she said yes. There was no way her games could distract me at that point, and she knew it.