That makes sense. Someone who would rather have us all in the dark, and a proactive person like Dia is likely the first on their list.

[Tamamo straightens up.] We must not let them get away with murder! They will be rewarded if we do so! Whoever it is in our midst... or perhaps Fav and his master themselves. Who knows? So, let's look and see what's around in the rooms on the third floor. If the earlier investigators are correct...

[She is there, and died there. So...]

Who knows, perhaps the little time lapse might produce something else entirely.