Exhibiting her paintings and miniatures widely, Hills won a number of medals at national and international expositions, including among others the 1900 Paris Exposition, the 1901 Pan-American Exposition, the 1904 St. Louis Exposition, and the 1915 Panama-Pacific International Exposition. Between 1917 and 1919, she exhibited with an informal and short-lived group of women artists in Boston led by Lucy Scarborough Conant and known as "The Group".