this...woman is so dumb. She didn't knew demon's existed! She was confused at your behavior and attire and became frightened by the sudden appearance and attack of a demon, showing that as a normal civilian, she had no knowledge of the ancient war happening between demons and Demon Slayers.

She lived blissfully unaware from the fact that she was the fake wife of a horrendously monstrous being. Muzan kibutsuji. 'Tsuhikiko'...