For the Board she also painted a copy of Warwick Castle's famous Van Dyke portrait of Queen Henrietta Maria,[7] for whom Maryland is named.

[1][8] MacKubin made paintings of society women in England and in the United States cities of Boston, New York, Baltimore, Washington, and St. Louis.

[2] The people whose portraits she painted include Joel Chandler Harris, Basil Gildersleeve, Mrs. Charles J. Bonaparte, Justice Horace Gray, Senator George F. Hoar, and Mrs. Thomas F.

[1][8] MacKubin began exhibiting her works and winning awards in the United States, London and Paris beginning in 1893.

[2] She exhibited her work at the Palace of Fine Arts and The Woman's Building at the 1893 World's Columbian Exposition in Chicago, Illinois.