Oh ok, so that girl I believe is doomed lol. Later on when walking through the school's backyard you might get an event that says something like ''-Random girl- is sitting on the backyard, but...'' And you get three options, one is to order her back to class, the other is to warn her about the dangers, and the other one is to ignore her.
If you order her back to class then nothing happens to her, if you warn her about the dangers then she has a 50% chance of being ok and a 50% chance of getting kidnapped. If however you ignore her then she will get kidnapped, a few days later when walking through the backyard (or its whereabouts) you will hear some girls talking about a missing girl, which would be the one in the backyard.