Just a dusty version of Daisy.
Insanity Daisy will start in Janitor Closet off camera. Then she goes to Meat Freezer and Longue, before going to office. she will speed other suits, and you will be unable to open monitor. Simply shut the power to make her go away.
Behaviour (Power out)
Repelling Insanity Daisy by shutting the power doesn't means she is gone. He will appear again as a hallucination. Just hide or flash at her to make her go away. Failure to do will cause to the same as phantoms.