Peace Omega,
I was rereading your post about that woman that proclaims to be Christian and yet she is walking as though she is free to sin? Anyway, the way my wife treats me is that when I say something, she at times calls me on it so that I can back up what I say. It's not that she doesn't believe me but it's her personallity for those to back up what they say.
What I am trying to get at is maybe you can ask her about her faith and and just ask questions further to see what is she knows. When she replies with something that is unfounded in the Bible, call her on it. In other words, ask her to show you the scripture.
I don't know if this will work because I really don't know this person but you do and so it will have to be your call if you want to approah this.
Otherwise, just pray for her.
For His Glory,
Eddie