Is she a genuine believer? Genuine? If you don't see fruit, maybe you should have her watch "Paul Washer Shocking message". He really dissects scripture and illuminates what it means to be a Christ follower.

Pray beef. And you need to also talk with her. But you need to guard your heart and not be puffed up (Gal. 6:1,2) When you pray, pray how God would have you pray. Not for her ultimately, but for His own glory. In faith. And when you speak with her, do it in love...i know my pride starts to fidget when i'm told i'm wrong, but if i know that the person confronting me loves me, the process becomes easier.

May this help you. I am not sure how old that message was, but send me a message and update me. I'd like to know how things work/ed out.

prayin for you by lecrae is remarkable...make her listen to it and put the lyrics in front of her...if she pushes you away after hearing that idk what to tell you

well dont tell her its christian music i no that sounds tkindas mean and take her to church if you no its gonna be really good wish you luk

i just read the Comment you left and i can see that you care for your sister. i don't see that alot anymore but i think you would have to talk to her away from her boyfriend just you and her. You should make her understand how much you care for her and only want the best for her talk about jesus and what he went through so that we could live and understand just talk about anything. after you talk with her. the only thing you can do is pray because you can talk and talk all you want but she must make that decision herself to change only she can change her behavore and yes my spelling is off but talk to her after that just pray and pray about it i tell you ill be praying for you and your sister too