Her Journals (1861, Eng. trans., 1865) and her Lettres (1864, Eng. trans., 1865) indicated the possession of gifts of as rare an order as those of her brother, though of a somewhat different kind. In her case mysticism assumed a form more strictly religious, and she continued to mourn her brother's loss of his early Catholic faith. Five years older than he, she cherished a love for him which was blended with a somewhat motherly anxiety. After his death she began the collection and publication of the scattered fragments of his writings. She died, however, before her task was completed.
See Sainte-Beuve, Causeries du lundi (vol. xii.) and Nouveaux Lundis (vol. iii.); G Merlet, Causeries sur les femmes et les hIres (Paris, 1865); Selden, L'Esprit des femmes de notre temps (Paris, 1864); Marelle, Eugénie et Maurice de Guérin (Berlin, 1869); Harriet Parr, M. and E. de Guérin, a monograph (London, 1870); and Matthew Arnold's essays on Maurice and Eugénie de Guérin, in his Essays in Criticism.