Addressing what a haunted bathroom might do to a young girl.
My idea there was that Minerva might have actually discovered Myrtles corpse, since Minerva was only a year or two ahead of Tom Riddle. Even more traumatising. We don't know all that much about what actually happened the first time the Chamber of Secrets was open, just that Minerva, Hagrid and Tom were all students, Dumbles suspected Tom of being up to no good, and that the Basilisk killed Myrtle. But imagining the horror of a teacher who had been the student to discover the body of the one person killed by the Basilisk the last time around... *shudders*