I don't think she believes they remember that, she probably thinks they were possessed at that time, and some outer being was talking to her through them, rather than them being conscious as babies.
BUT... they did continue to talk with her later on (that's how they got her to bring them to the show where they did the light sticks dance), so she might believe they are aware of that talk.
of course, another explanation is that she failed. she was tasked by the gods to protect Ai and her babies, and she failed. Ai is dead. she squandered her chances (and lost her husband), she is lucky to be alive after such transgression towards the heavens. maybe she even took the twins as her kids to show the gods she repents and protect her life. maybe she believes that her second marriage will come eventually.
I don't believe either of those explainnations.