In the 1962 Missale Romanum there are texts available for the feast "B. Mariae Virginis Divini Pastoris Matris" in the section toward the back of Masses for certain places.
Here is the nice…
Domine Iesu Christe, Pastor bone,
qui pro ovibus tuis animam dedisti,
nosque populum tuum et oves pascuae tuae
in Cruce pendens Matri Virgini commendasti:
ipsa interveniente concede; ut, te Pastorem nostrum sequentes in terris,
ad pascua aeternae vitae perducamur in caelis….
O Lord Jesus Christ, Good Shepherd,
who gave Your life for Your flock,
and while hanging on the Cross
commended us Your people and the flock of Your pasture
to the Virgin Mother:
as she is intervening, grant that we, following You our Shepherd here on earth,
may be led to the pastures of eternal life in the heavens.