Father Gabriel of St. Mary Magdalen tells us,

“The sacrifice of Jesus became Mary’s sacrifice not only because Mary offered it together with Jesus, and in Him, offered her own Son, but also because by this offering she completed the most profound holocaust of herself, since Jesus was the center of her affections and of her whole life. God, Who had given her this Divine Son, asked on Calvary for a return of His gift, and Mary offered Jesus to the Father with all the love of her Immaculate Heart in complete adherence to the divine will.”  …

“Let us contemplate Mary’s sorrows, sympathise with her and ask her for the invaluable grace of sharing with her in the Passion of Jesus. Let us remember that this participation is not meant to be merely sentimental — even though this sentiment is good and holy — but it must lead us to real compassion, that is, to suffering with Jesus and Mary. The sufferings God sends us have no other purpose.

“The sight of Mary at the foot of the Cross makes the lesson of the Cross less hard and less bitter; her maternal example encourages us to suffer (with her) and makes the road to Calvary easier. Let us go then with Mary, to join Jesus on Golgotha; let us go with her to meet our own cross, and sustained by her, let us embrace it willingly, uniting it with her Son’s Cross.” (Divine Intimacy)