But in terms of facial expression, she is described as being emotionless. Though I suppose she is meant to freak out in other scenes, I haven't gotten too far into the PS3 graphic games and so can't comment on if she ever changes facial expressions in them at all.
Also since only the first two were written conclusively by Yasu alone, the baby-switch could have appeared in Game 4 as Tohya may have remembered it. That certainly would give you a meta crisis, if the person you are supposed to be but don't remember being may have actually not been who they think they should be...
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