What does it mean when a woman who is tough, distant, maybe rude, flirty-confident and "too cool" in demeanor?

...is sweet, shy and clearly vulnerable around you? Of course, it usually means she likes you. But is it something more (not love but..)? What is it you're doing to her that puts her in that place? Her emotions are so easy to read on her face and the vulnerability in her expression...you can see that you could kiss her or have her right there and she wouldn't do anything to stop it