Why did the Luxembourg government go into exile during the German invasion of 1940?

When Nazi Germany invaded and occupied Luxembourg in May 1940, the government and Grand Duchess Charlotte chose to go into exile because they refused to collaborate with the occupying forces.123

This decision stood in contrast to the previous occupation during World War I, when the reigning grand duchess, Marie-Adélaïde, had been criticized for tolerating the German presence. By fleeing, the government and the Grand Duchess maintained the legitimacy of the Luxembourgish state and became symbols of resistance and sovereignty throughout the war, with Charlotte providing encouragement to her people via radio broadcasts from abroad.231