Obviously, when the compilers of the chronicle were not on their toes. Both Viktoria Luise and Viktoria Margarete were married in May 1913, but VL was the Kaiser's daughter. Agra married Heinrich XXXIII Reuss on May 17 at Potsdam. It was a marriage forced by the Kaiser, and it was an unhappy marriage that ended in di divorce. The train was not the usual heavy silver cloth but "was made of a very light graceful material bordered with tiny bunches of myrtle and orange blossoms." Agra's veil was Brussels' lace and she wore the Prinzessinkrone.
I have a dozen or so postcards of VM before marriage and during her marriage and with her husband ... and he doesn't have a beard.
VM's guard of honor was the First Foot Guards, as all three brothers served in that division.
I don't think the photo is of VM. She was married at the Neues Palais, so it is unlikely there were outside shots -- photos of German royal weddings (Prussian) from that time period were not largely not photographed for the media. Maternally, VM and VL were first cousins as their mothers were sisters. VM's father, Friedrich Leopold, was the grandson of Prince Karl of Prussia, Karl was the younger brother of Wilhelm I of Prussia (father of Friedrich III.)
VM's paternal first cousins included the Connaughts as their mother, Luise Margarete, was Friedrich Leopold's sister.