Here are the Propers for the Mass of Mary, Mother of the Church (in Latin).
Here is the Collect for the Mass (and hours) for Memoria Beatae Mariae Virginis Ecclesiae Matris, which is simply from the Votive Mass Mary, Mother of the Church:
Deus, misericordiarum Pater, cuius Unigenitus, cruci affixus, beatam Mariam Virginem, Genetricem suam, Matrem quoque nostram constituit, concede, quaesumus, ut, eius cooperante caritate, Ecclesia tua, in dies fecundior, prolis sanctitate exsultet et in gremium suum cunctas attrahat familias populorum.
God, the Father of mercies, whose Only-Begotten affixed to the Cross established His Mother the Blessed Virgin Mary also as our Mother, grant, we beg, that as her charity is also at work, Your Church, ever more fruitful each day, may exalt in the sanctity of progeny and may draw into her bosom all the families of peoples.
(courtesy of P. JZ)