You have a point but the 5 Volts you refer is a Direct Current source.
If the resistance between two locations on her body were 25 Ohms then 1 watt of DC power of heat is applied.
I am inclined to think there is more to this story and I don't think 5 VDC can harm the nervous system such that it doesn't recover.
It isn't the voltage that kills, it is the current. The threshold for death is 0.2 amps. That would be achieved at five volts if her resistance was 25 ohms.
I think she got the 120V in the other side of the charger.