As a nun, Sister Faustina has a deep connection to the saints. She eventually would gain the title herself. Her closeness and devotion to the holy ones no doubt helped her attain a high degree of glory in heaven. What a good model for us. Be close to the saints if you yourself want to make it to heaven to glorify God for all eternity.
Here's what she wrote in her diary about good Saint Joseph. Let us pray the prayers she did for his special protection.
Saint Joseph urged me to have a constant devotion to him. He himself told me to recite three prayers [the Our Father, Hail Mary, and Glory be] and the Memorare once every day. He looked at me with great kindness and gave me to know how much he is supporting this work [of mercy]. He has promised me this special help and protection. I recite the requested prayers every day and feel his special protection. (Diary entry 1203)
Memorare
Remember, O most pure spouse of Mary, and my dearly beloved guardian, Saint Joseph, that never was it known that anyone who invoked your care and requested your help was left without consolation. Inspired with this confidence, I come to you and with all the ardor of my spirit I commend myself to you. Do not reject my prayer, O Foster Father of the Savior, but graciously receive and answer it. Amen.
Novena prayer
Good Saint Joseph, ever watchful guardian of the Holy Family, protect the chosen people of Jesus Christ, keep us free from the blight of error and corruption, and be our ally in the conflict with the powers of darkness. As of old you rescued the child Jesus from the plots of Herod, so now defend the universal Church from all harm. Keep us one and all under your continual protection, so that by your help and example, we may lead a holy life, die a happy death, and come to possess eternal life in heaven. Amen.