Hm. First, remember to calm down. Go look in her room and see if she has a phone book. If she does look in it for some of her close relatives, friends, etc and go around asking them if they've seen her or heard from her. If you look in her room and she doesn't have a phone book or any numbers go call 9/11 and report her as missing. When and if they come over/or you go over take a picture of her with you. Maybe they'll do an amber alert and maybe one of her relatives will see it. When you're done with all of that go search around places where you think she may be at. (places she usually goes to.) You never know what the situation could be. If you need anymore advice on what to do PM.
You can always go to sites and they'll tell you what to do better than what I did:
Click Me. :)
Good Luck. 
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They're people who want to screw around all the time,
which interests me not at all.
God knows we've done that, been there,
and we don't want to do that any more.
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