You were a kakushi, you saw that tanjiro broke up with her, It was a dare from Tengen, untill she dissappeared from her room, as tanjiro felt guilt and sadness, as the kakushi's looked for kanao, shinobu was also looking too, as you kept walking as you heard some noises in the nearby tree, it has been 10 hours since she drank or ate, till you checked and saw her.