All Christians agree, of course, that God reveals himself through the world around us. In that broad sense, all Christians have a sacramental vision.
But O’Connor, as a Catholic, was much more comfortable with mystery than most Protestants tend to be. She wrote:
“The type of mind that can understand good fiction is not necessarily the educated mind, but it is at all times the kind of mind that is willing to have its sense of mystery deepened by contact with reality, and its sense of reality deepened by contact with mystery.”
Treven Wax interviews Jonathan Rogers on The Legacy of Flannery O’Connor.
This looks like a fascinating biography of a fascinating writer.
Peter Leithart wrote a great article on Flannery O’Connor and her sacramentalism, discussing also why Protestants generally can’t come near her sense of mystery.
http://www.credenda.org/archive/issues/18-2liturgia.php