I've been dating a (gorgeous) girl for several times until now.
We're getting real close, we do great together and she's the first girl in over a year I could imagine more than just the usual stuff. She had a bf when we first met, so our intention of dating then wasn't obvious then, it was rather to share music.

Now I need your help, I need to find out wether she has similar views. She's coming to me tonight and we'll cook together and share some music (ye we're both music fanatics) and now I need ways to find out what she's up to without losing face, as she's that kind of babe, a little arrogant and always keeping a certain distance to you. e.g. outside, being asked if she's cold she would deny, always, she's... different. :] We've never kissed or had kino like that.

How can I do that best?

I'd say kino tests, how long she holds your hand, reaction to the hand on shoulder.

get close to her and observe the eyes and feet (not in a pervert way just notice if she's "checking you out" or your lips, or if the feet ar at your direction or if her legs are open).

generally just look for the ol' IOIs. or indicators of stress.