McMillan attended the
Sorbonne in Paris. She was a freelance photographer. She studied with the photographer J. Ghislain Lootens along with her mother. In 1986, she presented 25 of her mother's albums to the
Library of Congress together with some 5,000 of her own photographs, including images of presidents and international dignitaries. During World War II, she managed the McMillan family farm in
Glyndon, Maryland while her husband served in the Navy in the Pacific theater. McMillan was a trustee of the
Baltimore Museum of Art and the
Greater Baltimore Medical Center. == Family ==