How did that person at work get sacked?

Doing speed, or coke in the bathroom. Coming back with pinprick pupils and sucking her teeth a lot, unable to stop bouncing her foot. We worked in a small call-centre and she was hilarious in a really uneasy way. Boppin around, forgetting what she just said, entering card numbers in the machine wrong and just endlessly twisting the phone cord around her fingers. The girl must have broke 3 cords in 3 days, she was probably awake that long by the end of it. Was off "sick." Then the day she came back, our manager just called her in in the morning and she flew out the door in a rage. Not a word to anybody. Absolutely cracked she was.