She felt a presence coming from the girls' lavatory, to the point where it made her head hurt.
"Uwah! My head hurts ...... I've got a bad feeling about this ..."
In denial, she entered the boys lavatory first only to find there was a gap spanning the entire width of the room near the middle, cutting off the entire far half of the room. The stalls in the far corner looked like they were about to collapse, and the mirrors were half cracked. The handles and pipes attached to the sink had a fair amount of rust attached to them. She attempted to turn the water on, and all she got from it was a painful groaning sound - it was pretty clear there would be no water coming out of that sink.
Then she noticed that, in the sink she had just attempted to turn on, the drain was completely covered with all sorts of unidentifiable dead bugs.
"... EEEEEEK!"
She ran out of the room and wound up back in the third floor hallway. The same presence she felt before was still there, except it was stronger. Rather than feeling a slight pain in her head, her entire head started pounding in every direction, such that she could no longer tell where the spirit was coming from.
"... Ugh..."
"Hahahaha ~ ahahahahahahahaha ~"
She heard a mysterious, almost playful-sounding laugh. She could tell whoever this was wasn't up to any good.
"... OH GOD!"
She sprinted off running towards the exit and down the stairs to the second floor. The stairs were straight, with a landing halfway down where they turned around. When she reached the landing, she tripped, letting out a cry of pain. Tears started streaming down her face, indicating that she thought she was clearly done for. Then she noticed a shiny object on the landing, which appeared to be a key.
This appeared to lift her spirits somewhat. Immediately, almost as if via pure instinct, she grabbed the key and sprinted down the second flight of stairs at full speed.