In 1912, a group that would later become the National Association of Directors of Girls' Private Camps met to discuss the future of girls' camp. "The interest in girls' camp grew after higher education for women was no longer a rarity and the graduate degree became the goal of more college graduates. Women had a wider choice of careers, and women's suffrage was on the way."
Information from Eleanor Eells' History of Organized Camping: The First 100 Years, pp. 88–89.