Sorry to read about your doll. We understand it was your favourite toy. Do you think there was a little carelessness on your part? Try to recall if you had put it somewhere else and forgot. It seems strange that someone likes a thing and on the other hand shows laziness in finding it if it is lost. You should try to find it at your home first. If you are so serious in bringing the doll to the school function, arrange another or tell your friends that you will skip the event.