I have a friend who is a major fangirl for many celebrities/music groups/sports players. She takes it too far, IMO, with weeks of posts about the loss, how she will remember them, etc. Yes, she has called out of work before because she was too upset.
I can't comprehend that level of emotional distress over a stranger. Mass disasters and tragedies get to me, but not the death of a celebrity.
I would never let it affect my professional life.
What can the administration do? And is a Nirvana t-shirt appropriate apparel for a middle school teacher?