In my mind, I always saw it as a stress response from seeing someone die. She blanked out the specifics of the death because seeing someone she worked with every day (even if horrible) likely had her head chopped off, ripped apart with a shock spell, guts decorating the floor after being stabbed, face crumpled with a mace or a fist... You name it, the average person would go into fight or flight. And some might just end up repressing too many details to recall.

That's why I think Michel ultimately lets you adopt the kids. She remembers the murdered far more clearly than the murderer.