ok that makes sense
but my question remains- isn’t the problem more in the wiring in her house?
Not in this case.
Mystery at Topaz substation
http://www.easyreadernews.com/35687/edison-stray-voltage/
...Brett Lacy of Web Electric in Redondo Beach. Lacy used a voltmeter and confirmed that the shower head was carrying a charge of about three volts. Perhaps even more disturbing, he checked the gas line outside the house and found an 12 volt charge.
Lacy turned off the home’s main breaker, and the voltage readings remained the same. He realized then the problem had nothing to do with the house itself. The earth under and around the home was carrying a charge.
Also note, that eventually, they made repairs to the substation and modified the gas piping in the area.
Redondo Beach Residents Still Concerned About Stray Voltage
http://losangeles.cbslocal.com/2012/10/15/redondo-beach-residents-still-concerned-about-stray-voltage/
...
On Monday, crews from Southern California Edison, The Gas Company, and a corrosion control company out of Gardena worked in and around the Topaz Substation, which sits next to the Knob Hill neighborhood.
...
Edison said workers were installing a new grounding system at the substation, while The Gas Company said it’s replacing 3,000 feet of an 8-inch diameter steel gas line with 8-inch diameter plastic pipe.