Shortly after the outbreak of World War I, Bacaloglu turned to political activism and interventionism, campaigning for still-neutral Romania to join the Entente Powers, and supporting the annexation of Romanian-inhabited Transylvania. To this goal, she published in Bucharest the Italian-language essay "Per la Grande Rumania" ("For Greater Romania") and the French-language "Preuves d'amour. Conférences patriotiques" ("Proofs of Love. Patriotic Conferences"). In Bacaloglu's activity, irredentism blended with the cause of Pan-Latinism. She joined the Pan-Latin association "Latina Gens", which welcomed in members of all "Latin" nations and looked forward to a "Latin federation" of states. Working for this organization, she became close to Italian General Luigi Cadorna, described by Romanian officials as her "protector", and Foreign Minister Sidney Sonnino.