I am relatively new to pick up. I have had some success over the past few months. But recently I am unsure what to do in this situation.

Last month I hit it off with this gorgeous girl in the hall walking to class. We Exchanged numbers, made plans for next week. She cancels a few days before. O well, I shot her a text the following week. No reply, at this point I didn't really care and moved on.

Fast foreword I see this girl almost every day when I'm walking to my car. Every time she sees me she is with friends and says hi

I don't know if she is being nice or.. What would you do ?