Does she want to be more than friends???

I met this girl 4 months ago. We always hung out in a group setting and i found myself starting to all in love with her. We have so much in common and click well together. anyway, one day i called her and wimpily asked her to go out, she said she wants to be friends. SO the next day we acted like nothing really happened and went back to being friends. A month later i got fed up and broke contact with her. we didn't talk for a month and i finally called her. Since then she has called me a bunch and invited me to hang out with her just me and her on two occasions in the past week. We also made plans to go to two concerts this week. I cant tell if she is starting to like me or she still just wants to be friends. What should I do? please help!