That is likely to come up later, depending on where you are in the game. The key event there depends on how you handled the harpies at the Tower of Wind, too.
It may simply be a thing to come back to.
i eventually figured it out, i think the trigger was a convo i missed in the cypress castle basement. that said, turns out the person bathing was one of the harpies yet to be freed and the line was just triggered by the water on the bridge that would eventually be below her lol. just finished the true end, really loved this game! played it right after embric and qe, and im playing aaa as im typing. hope you keep making cool games!