Dorothy (Agnes) Donnelly (1880-1928) was an actress, lyricist, and a librettist. She was the daughter of the manager of New York City’s Grand Opera House. She made her acting debut in the stock company of her brother, Henry V. Donnelly at the Murray Hill Theatre in New York City. She became a well known performer in 1903 when she played title roles in Yeat’s “Kathleen ni Houlihan” and Shaw’s “Candida” in their first American performances. Her most celebrated performance was in the title role of “Madame x” (1910). She acted for another decade but after the success of her book and lyrics for Sigmund Romberg’s adaptation of Schubert’s melodies in “Blossom Time” (1921), she gave up performing and concentrated on her writing. Donnelly was married to Sigmund Romberg. The photographer of this cabinet card was celebrity photographer, Schloss. The photograph captures Donnelly in costume for “Soldiers of Fortune” (1902); so the image is a portrait representing the very early part of her theatrical career. The cabinet card comes from the Oral M. Heffner Theatrical Collection and was formerly the property of the Franklin County Historical Society. To learn more about the Heffner collection, click on the Cabinet Card Gallery category of “Oral M. Heffner Theatrical Collection”.
THE CABINET CARD GALLERY 
Dorothy Donnelly’s entry on Wiki says that she never married. So does her bio by McLean.
It is absolutely correct to question whether Dorothy Donnelly was ever married. A number of sources assert she was unmarried her entire life. However, the wikipedia entry about Romberg, states that he was married to Donnelly between 1908 and 1923 and that their marriage ended in divorce. The IMDb entry about Donnelly also reports that she was married to Romberg. What’s up with these conflicting biographies? First off, Wikipedia, as helpful as it often is, has some major flaws concerning verification of facts. As researchers, we must remember to use many resources to confirm information and not just rely on wikipedia. Louise Clay states that McLean’s biography of Dorothy Donnelly indicates that she was never married. Although there is conflicting information, and further research is needed; It would appear likely that McLean would be in the best position to accurately report on Donnelly’s marital status. Therefore, Donnelly was most likely never married to Romberg; they were just close musical collaborators.