Soon after this vision, France was in the throes of the Franco-Prussian War, which resulted in the end of France's Second Empire. On December 12, 1871, Adele wrote in her diary: "For France: to pray, expiate, suffer, love!"
The political upheaval of her country caused Adele great spiritual suffering and desolation, which her spiritual director ordered her to take to Christ in the Blessed Sacrament. After a time of prayer, she was struck "wild with a joy that stripped me of reason, I felt as though struck by lightning, and remained in the grip of a rapture I cannot describe."
Soon after this experience, and after the war had ended, Adele read an article in 1872 of a devout couple planning to build a church in honor of the revelations of the Sacred Heart of Jesus to Saint Margaret Mary.
She heard Christ calling her to be at this particular church, and over the next several years she consulted with her spiritual director and with the archbishop to establish perpetual adoration there, which has now been happening nonstop at the Basilica of the Sacred Heart of Montmarte since August 1, 1885.
Adele longed to establish a community of sisters devoted to perpetual adoration at Montmarte, but her health and other logistical issues prevented her for several more years.
Finally, in March 1897, Adele and two other sisters set up residence in an apartment in Montmartre, dedicating their lives to prayer and apostolate work and wearing white scapulars under their secular clothing.
On March 4, 1898, Cardinal Francois-Marie-Benjamin Richard de la Vergne of Paris authorized the establishment of the new order, and the Adorers of the Sacred Heart of Jesus of Montmartre were founded.
A few years later though, in 1901, the anti-clerical French government passed the Law of Associations, which greatly expanded the state's authority over religious orders and regulated their educational work. As a result, the sisters went into exile in London, where they were able to freely wear a habit for the first time.
They eventually settled at Tyburn, the "mons martyrum" ("mount of martyrs") in London where in the 16th and 17th centuries, several hundred martyrs – priests, religious, and lay men and women – were executed by the Protestant state for their refusal to give up their Catholic faith.
Throughout her life as a religious, Mother Garnier, who now went by Mother Mary of St. Peter, experienced intense physical suffering, so much so that when she went more than two hours without suffering, she wondered if Christ had forgotten her.
Despite her sufferings, which included debilitating migraines, her sisters say she remained cheerful and gentle with everyone, and counseled other sisters through their trials.
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She once told a particularly distraught young sister: "My poor little daughter, I have such pity for you. When you suffer so much, drag your cross on all fours if you must, and then, when things are a little better, try to get up and carry it more valiantly."
The order as a whole also suffered financial problems and strange demonic attacks, including instances of possession or objects being picked up and thrown across the room. But Christ promised Mother Mary of St. Peter that he would not let the order dissolve.
According to a report from The Catholic Herald, Fr. Gianmario Piga wrote a spiritual biography of the nun in 2012, in which he relayed the story of Mother Mary's witnessing of a Eucharistic miracle.
In a letter to Fr. Charles Sauvé, Mother recalled how she saw the Blessed Sacrament turn to bloody flesh.
"At the moment in which the priest took a particle of the Holy Host and put it into the chalice I raised my eyes to adore and to contemplate the holy particle," she wrote.
"Oh, if you could know what I saw and how I am still moved and impressed by this vision," she continued.