At the start I believe she did know that her dad thought of killing her when she was a baby but it seems like she forgot about it as she grew older. Since she said that she finally remembered. This also goes for her past life memories. It seems like the longer she lives in her new world the more she forgets her past memories
She was born incomplete, Irene her past life reached out to her so that she could live a happier life instead another tragic life. She only explained certain things so that she could live a better life. Think about it if you know you were hated and treated badly in the past then you would work harder and happier in the future or when you have a new life. But if you knew as soon as you were born into your new life your father tried to kill you how would you be happy. As a child that would be the only thing on your mind, “is he gonna try and kill me again? Does he really mean he loves me? What if he gets tired of looking at me and decides I’m not needed anymore?” How would that be any different from any of her other tragic lives?
So plot hole or anybody got an explanation? Rin is reincarnated from a past life and remembers those memories. But apparently she doesn't have any memory of her Dad trying to kill her as a baby? This character even said she was TOO young to remember. SO when did she remember her past life... did she not reincarnate with the memories when she was a baby like other isekai manwhas or??