Childhood schizophrenia is very rare, as I'm sure you were aware on the psych ward. I haven't heard anything about this being a feature of ASD. I think it's probably a good idea to get a psychological/neurological evaluation done to make sure it's nothing. If it is a psychotic disorder, it's possible that early readiness for it could make a big difference. If your kid is just typical and a good storyteller, then it's probably better to know that now so you can sleep easy.