[8] When President Herbert Hoover appointed her husband an assistant to the United States Food Administration, Kellogg joined him in his work as an internationally active war-relief speaker and fund raiser.

"[10] Kellogg also spent extensive time researching the Belgian Lace industry, publishing Bobbins of Belgium; a book of Belgian lace, lace-workers, lace-schools and lace-villages, a unique portrait of the women who worked in this industry, which suffered when Belgium faced occupation and the challenges of world war.

[11] During her time abroad, Kellogg developed an intimate relationship with Désiré-Joseph Mercier, a notable Belgian scholar and a famous leader in resisting the German occupation of Belgium in 1914–18.

Marie Curie, having refused to patent her discovery of radium, struggled to raise funds to secure the costly element, in 1921 priced at some US $100,000 per gram.

[14] Meloney and Kellogg, along with many other American women, facilitated a 1921 grass-roots campaign "to raise money to make a gift to Madame Curie on the occasion of her visit of a gram of radium for exclusive use in experimental work.