This is a lovely prayer to Our Blessed Lady from the Dominican Libellus, where it appears in the Exercitium Quotidianum:
O Domina mea, sancta Maria, me in tuam benedictam fidem ac singularem custodiam et in sinum misericordiae tuae, hodie et quotidie et in hora exitus mei, animam meam et corpus meum tibi commendo; omnem spem et consolationem meam, omnes angustias et miserias meas, vitam et finem vitae meae tibi committo, ut per tuam sanctissimam intercessionem et per tua merita, omnia mea dirigantur et disponantur opera secundum tuam tuique Filii voluntatem.
O my Lady, Holy Mary, I commend myself to thee, my soul and my body, into thy blessed trust and incomparable care, and into the bosom of thy mercy, today and every day and at the hour of my death. I commit to thee all my hope and my consolation, all my sufferings and miseries, my life and the end of my life. By thy most holy intercession and thy merits, direct and dispose all my works according to thy will and the will of thy Son.
(Translation - DF)