My 12,14.4, and 18 volt Milwaukee power tool battery chargers have a warning label that state 120 volts could be present at the charger terminals. Just because something is very small doesnt mean high voltage isnt present. I have never seen a fone charger with a ground pin. Even if it was plugged into a power strip the strip would have a ground and if plugged into a GFCI would have tripped. But the tip of the charger would not have tripped the GFCI due to the lack of a ground. It says she might have grabbed her fone while charging or attempted to plug it in.