Something is wrong

So i went back to school. Things are working out better than i thought. My friends treat me just the same as they use too and all the things are working out pretty well too. ( you will know what i mean here if you have read my last journal.)

There is something else that i need advice though. I have a friend. She hasn't come to school for a week now. Many of us trying calling her or texting her but she didn't reply any of us. She even deactivate her Facebook account. Today, the teacher told my friends and me that she had shifted to another school. We were all shocked to hear that. She never told anyone anything at all. It is like she is trying to avoid us or something. We were wondering the reason she left without saying anything and we are worried.

What do you think i should do??

ADVICE PLEASE!! I'm really worried about her. :)