Like Saint Thérèse of Lisieux, the Little Flower, Mariam knew the pain of family loss, lived a life of purity, wholeheartedly served God in little ways, and possessed spiritual depths that were hidden from others.
She was born to Giries Baouardy and Mariam Shahine, a poor Greek Melchite Catholic family. Twelve of her thirteen brothers died in infancy, and Mary's birth was an answered prayer to Our Lady. Her parents died when Mary was only two, and she was raised by a paternal uncle and moved to Alexandria, Egypt at age eight.
Betrothed in an arranged marriage at age 13, she refused to go along with it, insisting on a religious life. As punishment for her disobedience, her uncle hired her out as a domestic servant, making sure she had the lowest and most menial of jobs. A Muslim servant with whom she worked began to act as her friend with an eye to converting her from Christianity. On 8 September 1858, Mary convinced him she would never abandon her faith; in response he cut her throat and dumped her in an alley. Mary lived, an apparition of the Virgin Mary treated her wound, and she left her uncle's house forever.
She supported herself as a domestic, working for a Christian family and praying. In 1860 she moved in with the Sisters of Saint Joseph. Supernatural events began to occur around her, and the Sisters would not let her join their house. She was taken to the Carmel at Pau by a Sister in 1867, and became a lay sister. Later that year she entered the cloister, taking the name Mary of Jesus Crucified, and making her final profession on 21 November 1871.
She continued to experience supernatural events. She fought off a demonic possession for 40 days, received the stigmata, was seen to levitate, had the gift of prophecy and knowledge of consciences, and permitted her guardian angel to speak through her. She helped found the missionary Carmel of Mangalore, India. She returned to France in 1872 and built a Carmelite monastery in Bethlehem in 1875. Supernatural gifts aside, she was known for her devotion to the Holy Spirit, even sending word to Pope Pius IX that the Spirit was not emphasized enough in seminaries.
She died at Bethlehem in 1878. She was beatified by Pope John Paul II on November 14, 1983 and canonized by Pope Francis on May 17, 2015.