Question

Hello,
I need help understanding something. My girlfriend tells me that last year she would hear people in her head and they would talk to her and argue amoungst themselves in her head. She said there was one who would cry and get made fun of by the mean one. The mean one would also tell her to cut herself and she would wake up and there would be cuts on her wrist she didnt remember doing. Im a psychology major and the three voices sound like the id,superego,and ego to me. Is she schizophrenic or just have a huge imagination. I would also like advice on the cutting situation too. She doesnt hear the voices or cut anymore or so she tells me. Thanks for any help.