>>82212792
She was actually exposed and tortured many times, forcing her to develop the emotional blunting necessary to survive. She was beaten to death for emotional outbursts in the past, each time being reborn into a fresh clone body with her memories broken and shuffled. This eventually leads her to develop the personality she's introduced with, which is after dozens of deaths and rebirths along with scattering of memories. Rei therefore can't tell what's real or not, and so assumes everything is not. Her behaviors are somewhat like PTSD due to long-term cPTSD in combination with memory loss. Her memory is backed up on a regular basis but one of her clones can't fully take on the same state she was in before she died. So therefore her memories become scattered and she isn't able to differentiate between what's real or not.
Remember, you're noting but a doll pretending to be a human.