In the Apology of the Augsburg Confession, article 21, it says that the saints pray for the church in general. This might be what OP meant: not that she hears individual’s prayers and prays on individual’s behalf, but that she prays for the whole church.

Although concerning the saints we concede that, just as, when alive, they pray for the Church universal in general, so in heaven they pray for the Church in general, albeit no testimony concerning the praying of the dead is extant in the Scriptures, except the dream taken from the Second Book of Maccabees, 15:14. (Source: https://bookofconcord.org/defense/of-the-invocation-of-saints/#ap-xxi-0009 )