Something is missing from this story (and other versions of it that are all over the media) – a 14 year old taking a bath, reached for her cell phone that was connected to a charger, and this caused her death by electrocution.
A cell phone charger outputs 5 volts, typically at less than 1.0 amps (newer chargers may go up to 2.0 amps). This low voltage and power level is not going to kill anyone, in a bath tub or not.
If this is a true story (and we have no way of knowing that) it is likely she attempted to plug the charger in to a wall outlet and made contact with 110 volt AC power, which is often lethal. (Update: Newer reports note this involved a charger plugged into an AC electrical extension cord.) The cell phone part of the story creates the novelty that translates into clicks, eyeballs for advertisers, and social media sharing.
A search on Facebook shows untrue claims such as “Remember your phone is an electrical device that will electrocute you when plugged in and near water.”
At this point, a lot of people are going to believe that you can be electrocuted by your cell phone, which is nonsense.
Similarly, a widely spread news report claimed Amazon’s Alexa called 911 during a domestic violence situation. Amazon says this is impossible.
Taken together, consider how these two relatively unimportant stories are translated into popular lore. Many people will vaguely remember these stories, which then become “facts”, even though neither is true. Most of what we think we know comes from the media and social media (and perhaps personal conversations). Unfortunately, most of the items promoted by media and social media are designed to hook our emotions and shut down our brains. News reporters intentionally use methods defined for propaganda to generate clicks to their stories – and you won’t believe what happened next!