Our Lady “never introduced herself as a co-redeemer, rather as a disciple,” Francis said in his December 12 homily for Our Lady of Guadalupe, although Our Lady never introduced herself as a “disciple.”
He vilified introducing new Marian titles and dogmas a “foolishness.” The Church existing before Francis introduced hundreds of Marian titles (e.g. in Marian litanies) and proclaimed four Marian dogmas (Mother of God, Virginity, Immaculate Conception, Assumption).
Attempts to proclaim the fifth Marian dogma of the Co-Redeemer were strong throughout the 20th century but Pius XII vetoed them although this title has been used and discussed since the 15th century.
Pius X invoked it in a prayer which is part of an official Church document (AAS [6] 1914, 108). The title was also used by Pius XI and John Paul II.
(source: Gloria TV)
ACT OF REPARATION
O blessed Virgin, Mother of God, look down in mercy from heaven, where thou art enthroned as Queen, upon me, a miserable sinner, thine unworthy servant. Although I know full well my own unworthiness, yet in order to atone for the offenses that are done to thee by impious and blasphemous tongues, from the depths of my heart I praise and extol thee as the purest, the fairest, the holiest creature of all God’s handiwork. I bless thy holy name, I praise thine exalted privilege of being truly Mother of God, ever virgin, conceived without stain of sin, co-redemptrix of the human race. I bless the Eternal Father who chose thee in an especial way for His daughter; I bless the Word Incarnate who took upon Himself our nature in thy bosom and so made thee His Mother; I bless the Holy Spirit who took thee as His bride. All honour, praise and thanksgiving to the ever-blessed Trinity, who predestined thee and loved thee so exceedingly from all eternity as to exalt thee above all creatures to the most sublime heights. O Virgin, holy and merciful, obtain for all who offend thee the grace of repentance, and graciously accept this poor act of homage from me thy servant, obtaining likewise for me from thy divine Son the pardon and remission of all my sins. Amen. (Raccolta, 1950)
Catholicism Pure & Simple 
Mary is no co-redemptrix of the world. This is idolatry of the highest order and insanely unCatholic.
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By Mark Miravalle, Professor of Theology and Mariology:
“The title, “Co-redemptix,” refers to Mary’s unique participation with and under her Divine Son Jesus Christ, in the historic Redemption of humanity. The prefix, “Co,” comes from the Latin “cum,” which means “with.” The title of Coredemptrix applied to the Mother of Jesus never places Mary on a level of equality with Jesus Christ, the divine Lord of all, in the saving process of humanity’s Redemption. Rather, it denotes Mary’s singular and unique sharing with her Son in the saving work of Redemption for the human family. The Mother of Jesus participates in the redemptive work of her Savior Son, who alone could reconcile humanity with the Father in his glorious divinity and humanity.”
Mary’s entire existence has been one of cooperation with the Lord. So it was on Calvary. She who was preserved by God from Original Sin at the moment of her conception and heard from the mouth of Simeon that “you yourself a sword will pierce so that the thoughts of many hearts may be revealed” accepted the salvific death of her Son not with a “hands-off” approach but instead by embracing it. The Second Vatican Ecumenical Council (1962-1965), in its Dogmatic Constitution on the Church (Lumen Gentium) of November 21, 1964, painted this picture of Our Blessed Lady’s collaboration with the Almighty, which included her heroic surrender to Christ’s ignominious death.
“Thus the Blessed Virgin advanced in her pilgrimage of faith, and faithfully persevered in her union with her Son unto the cross, where she stood, in keeping with the divine plan, enduring with her only begotten Son the intensity of his suffering, associated herself with his sacrifice in her mother’s heart, and lovingly consenting to the immolation of this victim which was born of her.”
Deacon Miravalle spells out precisely what Mary did next to her dying Son.
“Mary uniquely participated in the sacrifice of Jesus on Calvary and in the acquisition of the graces of Redemption for humanity (theologically referred to as “objective redemption”). Mary offered her Son and her maternal rights in relation to her Son to the Heavenly Father in perfect obedience to God’s will and in atonement for the sins of the world. Mary’s offering of her own Son on Calvary, along with her own motherly compassion, rights and suffering, offered in union with her Son for the salvation of the human family, merited more graces than any other created person. As Pope Pius XII confirmed in his encyclical On the Mystical Body, Mary “offered Him on Golgotha to the Eternal Father, together with the holocaust of her maternal rights and her motherly love, like a New Eve for all children of Adam.”
https://www.catholic.org/featured/headline.php?ID=5154
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So if the “Co” comes from “Cum” then why not use “Cum.” The term Co-Redemptrix is imprecise. “Co” means “jointly;” “Cum” means “with.” The term Cum-Redemptrix would go a long way to alleviating some of the concerns.
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