[ RO still feels bad every time she has to dash Kido's hopes, but she doesn't want to lead her on with false hope, since she believes that knowing the correct information is better than knowing something wrong and ending up sacrificing a lot for it. Since this place just seems... to have those sorts of things happen. ]

Unfortunately, that seems to be the problem. I suspect that the castle is the next area where we would be able to gather the next ofuda, but there's no entrance to such a place just yet, like underneath the school. I did ask whether these places are "time-locked", but I didn't receive an answer for that one. He seemed to imply that the next place will be a lot tougher than the last.

[ Or at least, that's what she's gathering from Minato's subtle pushing for her to strengthen her bond with her Persona. ]