At her funeral, during the Agnus Dei, she suddenly rose up from her opened coffin with great vigor. It is reported that she rose in the air up to the rafters of the church. The priest told her to come down; she landed on the altar and announced that she had seen heaven and hell and purgatory, and had been returned to earth to pray for those stuck in purgatory.
According to Dominican professor of theology at Louvain Thomas de Cantimpré, who wrote a biography after interviewing witnesses, including Cardinal Jacques de Vitry, her life changed radically from that point. She claimed she could not abide the odor of sin she smelled on people, and would climb trees or levitate to avoid them. She started sleeping on rocks, wearing rags, and seek other forms of deprivation or mortification.
She would stand in the freezing water of the river Meuse, roll in fire without harm, hang out in tombs (according to the report by Vitry). She would claim at times to be leading recently deceased to purgatory, and leading souls from purgatory to heaven. Her neighbors had differing opinions: some called her a holy woman touched by God, some said she was insane. The prioress of the nearby St. Catherine's convent remarked that Christina was always docile and obedient when the prioress asked her to do something, regardless of her bizarre behavior at other times. She lived her remaining days at St. Catherine's.
Although never formally canonized (and therefore sometimes referred to as Blessed Christina instead of St. Christina), she was nevertheless added to the Tridentine calendar with a feast day of 24 July, the day of her death in 1224.
Jacques de Vitry has cropped up a few times over the years in this blog, but has never been discussed directly. I want to rectify that tomorrow.