As a young woman Donnelly hoped to enter a religious order. At one point, she tried the convent life but it proved too taxing. Donnelly composed a number of poems during the early years of the
American Civil War, several of which were published, often unattributed and without her permission. Encouraged by her friends and family to protect her claims to these poems, which often dealt with themes of loss and grief, she collected many of them in her first book,
Out of Sweet Solitude, published in 1873. A prolific writer, during her lifetime Donnelly published over thirty books, including pamphlets and revised or rearranged editions, and produced hundreds of poems, including a number of collections of children's verse. Her poetry largely addresses Catholic and spiritual themes and she often composed poems to commemorate religious events and celebrations. She authored two biographies:
A Memoir of Father Felix Joseph Barbelin, S.J., on the first president of St. Joseph's College (now
St. Joseph's University), and
Life of Sister Mary Gonzaga Grace, of the Daughters of Charity of St. Vincent de Paul, 1812-1897, the long-serving administrator of St. Joseph's Orphan Asylum in Philadelphia. Donnelly also served terms as chief editor of the Augustinian magazine,
Our Lady of Good Counsel, and as an associate editor of the Philadelphia Catholic weekly paper,
The Catholic Standard and Times. Donnelly died on April 30, 1917. A long editorial in the local Philadelphia Catholic newspaper described her as "one of the foremost Catholic woman-poets of America". ==Selected works==