Yes, not the Common Room, it could be too crowded. And she forgot something else she had to finish, but the Library began to feel very crowded after a while, weird.

However, Kaika was not expecting to find people here. Oh, right, a ghost and someone else. Still, people. Because that was Myrtle, if she was on the right track.

And...someone else she didn't know, maybe, it was hard to see. "Oh, sorry" she said, the moment after she entered the Prefects Bathroom. "Why, hello Myrtle..." hopefully she didn't get the ghost's name wrong. They could be quite unreasonable sometimes.