Unfortunately, there is a lot of confusion about this Saint.
Padre Pio, who had a devotion to her, stated that he felt any confusion over her is the work of satan.
Several of the common miss-information about the Saint is that the Cultus was suppressed in 1961. This is not true.
The Vatican recognized Saint Philomena today as strongly as when she was first canonized. The Universal Archconfraternity of Saint Philomena is still recognized and promoted by the Vatican. She is still recognized as the Patron Saint of the Universal Living Rosary and the Propagation of the Faith. Both organizations are still strongly supported by the Vatican.
The truth is that she was removed from the liturgical calendar in 1961. She had never been placed on the calendar in the United States and there are no churches that have changed their name, anywhere in the world, because of her removal from the liturgical calendar in 1961.
Several churches that bore her name in the United States were torn down, but that was in the name of progress, not in reaction to her being removed from the liturgical calendar.
She was canonized by Pope Gregory XVI.
From the liturgical approval of Gregory XVI to the papal decrees of St. Pius X, Nineteen acts of the Holy See in the course of five successive pontificates were issued in positive promotion of popular devotion to St. Philomena expressed in the form of elevations in rank of liturgical cultus, the erection of confraternities and archconfraternities, and the granting of plenary and partial indulgences.
Several acts of the Holy See particularly display the Magisterium’s approval and encouragement of ecclesial devotion to this Christian saint and martyr. Beyond the elevation of the rank of the mass and office previously granted by Gregory XVI, Bl. Pius IX approved a proper mass and office dedicated to St. Philomena with the papal confirmation of the previously submitted decree, Etsi decimo on January 31, 1855, a significant liturgical elevation, even though her name was never entered into the Roman Martyrology. The granting of a proper mass and office to St. Philomena, which took place following the return of Bl. Pius IX from a papal pilgrimage to Mugnano during his forced exile from Rome, was an unprecedented act in honor of a Christian martyr known only by name and evidence of martyrdom. Bl. Pius IX also granted plenary and partial indulgences to devotions in honor of St. Philomena at the Sanctuary in Mugnano.
Pope Leo XIII granted papal approbation to the Cord of St. Philomena with several plenary indulgences in association with its wearing, and accorded the title and privilege of “archconfraternity” for the respective Philomenian devotion and work in France. Pope St. Pius X continued the papal succession of encouragement for public Church devotion by approving the extension of the Archconfraternity of St. Philomena to the universal Church.
Far more than one solitary papal act by Gregory XVI, the papal Magisterium has repeatedly encouraged the nature and growth of ecclesial devotion to St. Philomena, in official recognition of her status as a saint, in public liturgical and devotional sanctions which extended to the universal faith and life of the Church, and thereby manifesting official and essential liturgical and devotional characteristics of her status as a saint as defined by the Church.
philomena.it