Can someone explain to me what's going on here?

I'll try to be as detailed as possible: My girlfriend and I have been dating since August. We've known each other since elementary school, and we decided to get into a relationship just before college (after not seeing each other for a few years, then reuniting). For her freshman year of college, she's currently going to a college halfway across the country, and we both accepted that our relationship was going to be long distance for our first year together. Now skip to November: We discovered that she was going to college near where I was going to college and we couldn't wait for it! We constantly tell each other we love each other, we Skype occasionally, and her best friends think I'm the best guy she's ever dated. We constantly talk about our lives , our future plans, what we plan to do when she gets here, etc. and I felt like things were going great, until about a week ago. For whatever reason, she has randomly decided to ignore me over the last 7 days. Over the last 7 days I've managed to talk to her on the phone once only and it was for only an hour (about things like our lives and how I gave her advice on what summer course to take, etc). That was Saturday, and since then I've made at least 4 different attempts to contact her with no response at all. I sent her a couple of Facebook messages (which it says she's read), a text, and I've called her a couple of times and got nothing. I asked her best friend about it last night, and she said: She's okay. I'm not really sure what's up but I would just give her some space if she's being kinda distant. I'm still clueless on what is going on here... We haven't fought recently, our conversation Saturday was full of things that made me think she couldn't wait to come (I asked her if she liked teddy bears and she told me she did so I told her that I was going to surprise her with one and she told me a story about how her sister's husband had done that for her sister and we talked a little about that). Just... What is going on here? Am I doing anything wrong? Am I missing something here? It may be worthy to note that she is currently on Spring Break, but she is still using things like Facebook. She has also kept our relationship status as In a Relationship on Facebook as well. I just have no idea as to what is going on here.

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