Just a small update. My wife and I went out to dinner with a friend of hers last night. I didn't really know the guy, but my wife has been friends with him for sometime and regards him as a very intelligent person. Landmark eventually came up in the conversation, and after hearing her description and my own concerns, he started asking questions of his own. In the end, despite her best attempts to defend Landmark, he concluded that Landmark was definitely trouble.
She was increasingly upset towards the end, feeling very defensive, and we wrapped up the conversation before it could turn sour. On the whole, I think the discussion was good for her. I certainly hope that it's making her think. Aside from this example, she's also had a couple of friends come forward with their concerns and I know that her family has plans to air their concerns over the holidays when they get together.
The danger now is that she might run for advice, i.e. "coaching", and the coach will find "ready made" answers for her to all the critics she encountered. In this way, she will feel "empowered" and get trapped even further into this cult. If you possibly can, try to take her attention away from Landmark. This is difficult of course because it means taking "control" over her liberties (freedom to speak, to choose, to do whatever she thinks is good for her,...), but actually, this is protecting her from Landmark's overwelming control. She might go to Landmark's Center (is she a volunteer ... or a participant as they call it?), but also "coaching" takes place very effectively over the phone. Can you prevent her from getting calls from her friends at Landmark without infuriating her? This can get very complicated, because those sharks at landmark will not let her go so easily. You will have to fight for her!