Excerpts of the Forgotten

[AU] Sorley was just a girl until she was accidentally taken from her universe by the Doctor. It was all an accident, at least he assumed so. It only became clear that something have been moving her so that she could have been at the right places at the right time. Why does everyone around her seem to know? What exactly is she? Eventual 11/OC (with lots of Koschei's help)