Yes, we will pray for your mother, cp. None have a character so bad that Jesus cannot transform it. We read in Scripture of demon possessed that were delivered from their demons. So, it is today, Jesus does not change. He can heal the sick today as well. We are living witnesses of the greatest miracle God can do, recreate us in His image.
While it takes time to produce an abundant harvest of fruit in the life, at conversion you mother can have all of the fruits of the Spirit right then and there! This radical transformation of character, Jesus can do in a moment. But, conversion is the end of a long protracted process of wooing by the Holy Spirit. As Sister Doreen has encouraged you, for many years your character has been testifying to the miracle of conversion to your mother.
You are the very best tool in God's hand to lead your mother to Jesus. As you demonstrate every one of the fruits of the Spirit when in great difficulties, you are witnessing to her the miracle of God that He wants to give her.
Heavenly Father, we come to you asking that you give our dear Brother colporteur, wisdom and grace to continue to minister to his mother. We pray for the angels and the Holy Spirit to work in ways they would not have worked if we had not prayed for this dear mother for whom you suffered and died. We thank you for answering this prayer in the very best way you can. We pray in the precious name of Jesus, amen.