I've been spending time with this girl whose recently (1 month) single from a 1 1/2 year relationship. Today was the first time we got some alone time and I KC'd her. She stopped it however and told me she doesn't want to complicate things at the moment. That she's afraid I'd immediately expect commitment. I noticed she still talks to her ex. Either she's playing games herself, or she's still attached to her ex and doesn't wanna lose him yet. Easy thing would be to walk away but we have the same mutual friends/social circle.

Where should I go from here? I think by kissing her she senses that she won, that she has me by the balls, chase over. Should I push her away for a bit?

Use some NLP to trigger those feelings she has for her ex and anchor them to yourself. She doesn't miss the guy, she misses how he made her feel....when things were good. Run some patterns on her like the Incredible Connection one.

Honestly, I'd disappear for a while, then show up with a new girl on your arm next time you see her. I've done it in a dorm environment, it worked like a charm. After she sees you with another (it has to be a better looking) girl, she'll want you. You can start where you left off from there. Make sure you don't come off as expecting commitment until well after f-closing repeatedly. Stay a flirt and tease around. go out and do things together, and escalate with kino.
Best of luck mate.