Brain Teaser

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Does she walk over the bridge for 2 and half minutes, waits for the guard to go back, then walk the further 2 and a half minutes. Stopping in the middle means she's in 'no man's land' and neither in Germany or Switzerland to get into trouble.
Take a gun, shoot both guards. Easy.
The answer to my riddle is that when the guard wasn't there she crossed towards Switzerland. When the guard appeared she turned around and crossed towards Germany. The guard then thought she was travelling towards Germany from the Swiss side without papers and sent her back to Switzerland.
The servant said, "My mother wants to see her grandson swinging on a swing of gold.