Go back and read my first post to you. You are not detached. You need to find a way to get there. Go dark and take your focus off of her and put it on you. If you want to post on FB, do it because its what YOU want to do, NOT because you think it will sway her one way or the other. NOTHING you do right now will have any impact on her decision making. She has got to decided on her own that she is going to do the right thing. You can't control her. And her family won't help you either. I know how badly you want to break her of this but letting go of her is the best thing you can do to save your M. Dump her and start moving on with your life. THAT is how you save your M.
Me: 48 y/o W: 47 y/o Together: > 20 yrs BD: Dec '15, then S 2nd BD: Mar '16, then I filed for D April '16: started piecing