3 dates, 3 kiss-closes - what's next?

I've been seing this girl for a month now. I have been on three "dates" with her and I have kiss closed her every time - but nothing more, she won't let her barriers down.

Now suddenly after the third time we were together, which was yesterday btw, she suddenly doesn't answer my texts and she seems as though she's freezing me out.

She seems insecure, as if she's been hurt by a guy before. But she has kissed me three times, and I'm 100% sure, that she is interested.

Should I call her and ask her where we stand (or tell her where I stand), or would it come off as needy? Because I'm tired of playing games, and I don't know where to go from here.