Her nine-year-old nephew collapsed and had to be resuscitated by his father and grandfather. He is currently being treated in intensive care, according to Bild.
Ricarda said her grandmother, two children and sister-in-law were also treated in hospital for minor injuries, while her son Cedrick suffered from headaches the following day.
Meteorologist Helge Tuschy told the newspaper there had been a "weak thunderstorm" and more than 30 lightning strikes were reported in the area after the incident.