For a long time i had Gabriel down as too many things, including being a hacker. I scrapped that part. She distrusts digital systems. A silent alarm could NEVER be as effective as a huge spiky grid falling down on intruders. Her methods will stay enjoyably archaic. Also the twisted household suffers from a lot of power outages and burnt fuses. The electricity is old, things live in the ventilation system - or did, until Gabriel "improved" it - one of the many reasons why gabriel uses candles in the cellar.