She wrote her first novel,
The Mere Living (1933), while she was a university student; it was first published under the pen name "B. Bergson Spiro". Several more novels followed. After the
Second World Warshe wrote extensively for literary journals including
Horizon,
The Cornhill Magazine and
The Twentieth Century. She also edited a collection of letters from
Elizabeth Barrett Browning to fellow writer
Mary Russell Mitford, published in 1954. Miller's literary reputation was established by the publication of her biography of
Robert Browning (1952), which earned her election to the
Royal Society of Literature. In
The New York Times, novelist
Francis Steegmuller called Miller's biography of Browning "fascinating and impressive", and wrote that it "supersedes previous lives of the poet". In
The Daily Telegraph Guy Ramsey wrote that "It is difficult to know which to admire the most — the industry of research, the delicacy of insight, or the moderation of statement." ==Personal life and legacy==