Mary is our Mother in the order of grace (Vatican II), so it’s important that we have a personal relationship with her. This is the tender gift Jesus gave us to be close to him.
She is constantly helping every human person.
Mary is truly the Refuge of Sinners and our Advocate and Helper (Vatican II), and Spouse of the Holy Spirit, our Comforter (JPII)
Popes have said repeatedly–in Encyclicals-- that every grace comes from Jesus through Mary. None have contradicted this. Doctors of the Church and great theologians like Fr. Reginald Garrigou-Lagrange have said the same. So it is the teaching of the Church.
Vatican II only said things which support this unniversal, maternal mediation, such as the quotations I’ve given.
I’ve quoted Blessed Pope Pius IX and Pope Leo XIII
Here is Pope St. Pius X:
“
The source, then, is Jesus Christ, of whose fullness we have all received” (John i., 16), “from whom the whole body, being compacted and fitly joined together by what every joint supplieth, according to the operation in the measure of every part, maketh increase of the body unto the edifying of itself in charity” (Ephesians iv., 16). But Mary, as St. Bernard justly remarks, is the channel (Serm. de temp on the Nativ. B. V. De Aquaeductu n. 4); or, if you will, the connecting portion the function of which is to join the body to the head and to transmit to the body the influences and volitions of the head - We mean the neck.
Yes, says St. Bernardine of Sienna, “she is the neck of Our Head, by which He communicates to His mystical body all spiritual gifts” (Quadrag. de Evangel. aetern. Serm. x., a. 3, c. iii.)"
http://w2.vatican.va/content/pius-x...x_enc_02021904_ad-diem-illum-laetissimum.html