First there was the call for a Mr. James Potter. Even though he wasn't the zombie father of The Boy Who Lived, it still required the intervention of a supervisor. Next was a call to a Mr. Moody. Constant Vigilance!
After that, she went away from the computer for a few moments, and when she came back, the Master of Misinformation had taken her chair (leaving her seatless). She reclaimed it, so when he came back, he had to go to another area to get another chair (hopefully an unoccupied one).