She authored memoirs that were controversial for their critical perspective and allegations about the political policies of various Spanish and foreign governments.

She traveled first to Puerto Rico,[3] then to Havana, Cuba,[4] and arrived in New York on 18 May on the Spanish Navy cruiser Infanta Isabel,[5] before making her way to Washington, D.C., where she was received by President Grover Cleveland at the White House.

[7] Eulalia was later admitted to membership in the Daughters of the American Revolution as a descendant of King Charles III of Spain.

Eulalia was the author of several works that were controversial within royal circles, although she never ceased to have frequent contact with her relatives both in Spain and elsewhere.

[8] 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.

In August 1925, Eulalia wrote Courts and Countries After The War (London: Hutchinson, 1925; reprinted New York: Dodd, Mead, 1925).