just pray for her and do not give up!!! i do not mean to give an answer as an easy way out, but to encourage you. when i became a CHRISTian i listened to these preachers that said i won so many people to CHRIST, or when i preached so many came to the LORD. i fianally learned that i can not convert or win anyone to the LORD, it is all HIS doing. GOD has the hard part ,HE is the only ONE who can change a heart. " no one comes to theSON, except the FATHER draws them."
be as good as witness as you can to her, lift JESUS up, and pray without ceasing!!!, and always have a calm spirit when around her
all we like sheep have gone astray; we have turned everyone to his own ways; and the LORD has laid on HIM the iniquity of us all.