Was going good now she won't respond

So I'm a 22yr old male and I was fooling around with an 18 yr old female. (here is a link to my previous dilemma with the same girl http://www.reddit.com/r/dating_advice/comments/n3o8g/jumping_back_in/ ) Everything was going good or at least I thought so, the last time i saw her was on the 13th of December, we hung out, I met her friends, and at the end of it we kissed and she talked about hanging out over winter break. From that time including now, I have not heard one word from her. On the advice of my female friends I held off on texting her for a few days, then just said "hey how are you doing". No response. So on Xmas I sent out a mass text to everyone on my phone saying merry Xmas, still no response.

I actually really like this girl but I'm tempted to just delete her number altogether. The ball is in her court now, I just don't know what to do and am trying to think positively. should I delete her number so that i don't screw things up if it is nothing?