"Who can measure the sorrows of Our Lady? The fullness of grace abiding in her, infused her with a love that completely transcended our human limitations. Because of this, her sorrow likewise knew no bounds. The two realities in her have been linked at various times to other titles, most notably "Our Lady of Compassion" and "Our Lady of Hope," both beautiful because they speak to this union of love and sorrow. Simeon’s prophecy, as Mary and Joseph present the infant Jesus in the Temple, is the first public pronouncement to Mary of where her relationship with the God-Man, her child, will take her (Luke 2:34-35)."
The Roman Catholic New American Bible Revised Edition has this footnote on Luke 2:35:
As the above cited commentary makes evident, there is no mention in Luke 2:34-35 of Mary participating in the atonement of Jesus Christ. That is a foreign concept which has to be read into the text of Scripture. There is nothing in this passage about Mary "taking on a universal motherhood for all of us." Such allegorization is driven by a radical desire to worship Mary.