Hey
well you should know that all girls are different, but yours sounds like the confident type. Sounds to me like she is ready.
Well if your gonna be at the movies make sure you sit at the last row, or go watch a movie where you'll know not a lot of people will be. that will make you both more confortable. When you guys are seated, try to make little comments on the movie previews, or the movie, that way you can get close to her, make sure you whisper softly though, and look at her when she responds, usually that move leads to a soft peck, but read her signals, if she backs up or doesnt look at you then try something else.
Reach out for her hand, dont grab it! just reach softly, and hold it, if she responds by holding yours then start playing with it, nicely!
If you two get going and start making out, dont be too...forward...after all you two will be at a public place.
Just when you begin kissing, turn half your body towards her, and with the arm that is closest to her gently place your hand on her face, maybe run it trhough her hair, or sofly rub her arm. if things get too intense dont jump on each other right there, suggest maybe to go somewhere else, your car or take a walk (and find a nice little corner..dont tell her this part!!) But the most important thing is to READ HER INTENTIONS!! make sure she is comfortable and that she WANTS to do it too.
Well thats the best i can do, hope this helps you.
Good luck