In 1896 Parren founded the Union of Greek Women. There was active involvement by the Union in collecting funds, sewing uniforms for soldiers, and training medical staff for the, short-lived, Greco-Turkish War of 1897. Her other achievements include: founding the Lyceum Club of Greek Women in 1911, in order to fight various forms of injustices in Greek society, and successfully lobbying for women's admittance to the University of Athens. Parren also wrote "A History of Greek Women" from 1650 to 1860 (in Greek).