This year, the global movement founded in 1912 by Juliette Gordon Low in her hometown of Savannah, Ga., turns 113. Known as “Daisy,” Low encouraged girls to embrace their unique strengths.

When Juliette Gordon Low was abandoned by her wealthy, philandering British husband in the early 1900s, she was a middle-age woman and nearly deaf, but she resolved not to sink into despair and ...