In 1912, under the pseudonym "Comtesse de Avila", Eulalia wrote "Au fil de la vie" (Paris: Société française d'Imprimerie et de Librarie, 1911), translated into English as "The Thread of Life" (New York: Duffield, 1912). The book expressed Eulalia's thoughts about education, the independence of women, the equality of classes, socialism, religion, marriage, prejudices, and traditions. Her nephew King Alfonso XIII telegraphed her to demand that she suspend the book's publication until he had seen it and received his permission to publish it. Eulalia refused to comply.