She was associated with the Polish-English intelligence service and with the Danish resistance movement Holger Danske and worked for the prominent Danish resistance member Citronen.She was shot by the Gestapo together with her Polish husband Lucjan Maslocha on the night of 2 to 3 January, shortly after they had married on New Year's Eve.
Lone died on the spot, while her husband died eight days later in the German hospital on Nyelandsvej.