It sounds as if you have a great deal more to be concerned about here with the apartmentand the wiring that the alleged fine that she is hoping to charge you. I think that the issue may fall under a breach of a warranty of habitability and that you should go down to the local landlord tenant court and let them know that this problem - which is a violation of a building code I am sure - and ask that you be able to pay your rent in to court until such time as the problem is properly fixed and for an abatement - reduction  - in the rent for the time it has been faulty and until it has been fixed.  Bet you that is more than $150. She can counter sue you.  Good luck.