Conversation so far:
When was Dorothy Day born?
Dorothy May Day was born on November 8, 1897.
Where was Dorothy Day born?
Dorothy May Day was born in the Brooklyn Heights neighborhood of Brooklyn, New York.
Who were Dorothy Day's parents?
Dorothy Day's father, John Day, was a Tennessee native of Irish heritage, while her mother, Grace Satterlee, a native of upstate New York, was of English ancestry.
Did Dorothy Day have any siblings?
Dorothy Day had three brothers and a sister.
Where did Dorothy Day go to school?
Dorothy Day graduated from Robert Waller High School in 1914 and attended the University of Illinois at Urbana–Champaign on a scholarship.

Question: what did she study?
Self-contained rewrite: What did Dorothy Day study?