For myself, that is one of the comforts of friendship: knowing that, short of after causing objectively grievous harm, my friends are dedicated to standing by me regardless of my choices. I believe that behind many solid friendships (perhaps it is an implicit part of love?) is the hope that through our interaction both our lives are better. Even when an individual does not share the same life view as yourself--especially in a situation where you feel that "morally" they are making poor choices--you can still have a positive effect on each other. A final thought: criticizing the friend to her face will likely not cause good, but discussing her choices out of a desire for understanding should not cause harm (assuming your relationship is stable), right? Good luck.