Reply #56: You cannot save anyone but yourself

[skygazer]

You cannot save your friend.

You can and probably should tell her that you're there for her but you feel she's making a big mistake with this guy but be aware that she may take that as a judgment on her and pull away from you as a friend. Assholes have that affect.

Besides that, you should butt out. She will very likely have to become miserable and desperate before she comes to her senses. That, unfortunately, is how people learn.