You should tell her, this is just a problem with the Viber's location service. Sometimes, although you are in a correct place, Viber might detect a nearby Point Of Information and attach the location to that place. It happened many times when I used Viber and I was at a restaurant, but the service location reported I was at a gas station nearby where I was earlier. Turn on and off the location service, enable the GPS and it should locate your more accurately.