Erdmann is a soldier in the rank of a Hauptfeldwebel and has been stationed in Munich. It was announced on 7 September 2009 FIL website that Erdmann had married Italian luger Gerhard Plankensteiner on 28 August 2009. Plankensteiner won a bronze in the men's doubles event at the 2006 Winter Olympics in Turin and gold in the same event at the 2009 world championships in Lake Placid.