Hello, I can understand her, because I have encountered similar things. You can call the police, but the most important thing is to let her family find a way. Maybe she will stay at her friend's school now, and I don't know whether it is the Internet cafe or the place he often goes. I hope you can find her as soon as possible.
I think someone was lost in our class at that time, and the teacher sent someone to look for it, but it was not found in the end. I didn't know I was back until more than a month ago.