Can't be positive that this article corresponds to the photo but it is the best match I can find in the Washington Post archives for 1912.

Washington Post May 12, 1912

Red Cross is Swift

Miss Oliver's Team Leader in First-Aid Contests.

Thrilling exhibitions and drills, in one of which an artificial mine was blown up, and supposedly injured miners rushed to safety by helmeted rescuers, yesterday afternoon held the attention of the ninth International Red Cross conference, and several thousand spectators who witnessed demonstrations of Red Cross first aid work, held on the Monument grounds at Seventeenth and B streets northwest. ...

The society young women dressed in regulation blue uniforms, with Red Cross bands on their sleeves, made a pretty sight as they went through their contests. There were four teams entered, and each did its best to win the sliver cup, and the four medals which went to the victors.

In the contest using Boy Scouts as subjects, they put bandages first for a severe cut on the point of a chin, and a scalp wound on the top of the head. Then they gave treatment for a person supposedly burned about the face, arms and hands. Next they gave treatment for a compound fracture to the left arm with severe bleeding and fracture between elbow and shoulder, the innjured person also having a crushed right hand and two broken ribs.

Miss Marion Oliver, daughter of the assistant Secretary of War, headed the team which was awarded first place. ...

Nah.