Immora, my niece Evie (batgirl) sees and hears things. Not only flashbacks. Has full blown visual and auditory hallucinations when stressed. Sees things, people, strange objects and so on. Hears the voice of her father (who tried to kill her), other's voices, usually those deceased. Don't believe it's schizophrenia. I have a nephew with that disorder, this presents quite differently. And. Evie was never like this before her trauma.

Jim.