Dear Friend Phil8888:
It is very good of you care so much about your friend. Before you decide what to say to her, there are some things that perhaps you might want to take into account. Firstly, you need to understand the strength of the thing you are dealing with. There is no equivalent in western culture to a guru and disciple relationship. It is a very personal level of interaction, and it is likely she trusts the guru more than any relative. Whether you can agree with that idea or not, that is the reality, because she will trust no one more than she trusts her teacher. If you try to tell her otherwise she might end up avoiding you. That is a risk you might to take into account. She can walk away from the guru any time she likes without anyone trying to stop her, but if she thinks that she’s truly found her teacher, she won’t leave any sooner than she would leave her own children. That is how tight this relationship you are dealing with is.
Regarding sin, in the religion she is practicing, it has a different connotation that it does in Abrahamic traditions. For her it will mean more being out of alignment or out of synch with proper or natural order, rather than being bad and needing punishment from God. In her faith, the only way to be free of sin is not forgiveness, but overcoming it by burning away the desire to sin. She will believe that is achievable through enlightenment, which will include seeing God in all creatures and in herself. She will believe that once she is able to see that, she will have no desire to defile herself or others. It is more a matter of freedom from the shackles of the desire to sin, rather than forgiveness from God. For her, God isn’t holding, nor ever has held anything including sin against her. He is simply awaiting the time when she will awaken to who and what she really is, and no longer have any wants or desires of any sort. That includes the desire to sin. She will believe that is possible for her to do in this very life through her own effort. For her there is no judgment day, and telling her that there is one isn’t going to sound like a very interesting idea.
You asked what you should say. My suggestion is this: Namaste, which means “that which is of God in me greets that which is of God in you.” Then she will know that you love and respect her for who she is. If you want to tell her that she’s wrong, that is up to you. You will probably see less of her.
Your friend
Sufjon