Anything is possible. Look at the folks who get elected to public office. Mindboggling. Anyway, have you yourself experienced this? Is it an older large twin that likes to vibrate? Maybe she is mistaking vibrations for shocks. My experience with handwarmers is that they either work or they don't. Sometimes right before they fail completely they may get really hot. But I have never been shocked by them. I don't think there are enough amps going through them to feel much at all. Unless a voltage regulator is doing something silly. Thinking out loud here. Don't know. Maybe she just doesn't want to ride anymore and wants to do something else. You should check this out. It might be an OK thing for you.