She managed to spin everything I said and, in the end, strongly hinted how I did not trust her. This was just slightly insulting considering she is not a part of my social set. Is she told by Landmark to speak this way to people? If so, its a mistake. At times Landmark leaders interact with participants in a direct psychological manner to enable participants to become aware of blind spots which are holding them back. They call this "coaching."
After the programs Landmark graduates are often tempted to try it at home--give Landmark-style coaching to friends and acquaintances--usually with the offputting results you describe. However, Landmark explicitly and repeatedly tells graduates not to do that. When graduates try that with me, I tell them I am not interested in being coached.
I can't see the value of spending 3 days in a progressively sleep-deprived state. It will not make me a better person or help me cope with past issues. It will, however, quickly wear me down physically and then mentally. Unless you have a long commute to and from the Forum, you can get seven hours of sleep or more on the Friday and Saturday nights of the program. For most adults it's a stretch, but not a hardship. People grow in lots of ways and often it is when they are challenged to go beyond what they do in their ordinary lives. That's true in life, and not just with Landmark. I recommend considering the Forum as an adventure that one gets psyched for, rather than something that happens to you and wears you down.
I'm not cool with Landmark's connection to 'est' either. Landmark is basically Phase II of est. I took est in the seventies so I have some basis for comparison. Much of the material is the same as, or even identical to, what was found in the est training. They have added some new distinctions about language from existential philosophy. They have smoothed out a lot of the rough edges, e.g, they are not as confrontive as they were in the est days, participants get more sleep and are not restricted from using the bathroom outside the scheduled breaks. In my opinion the Landmark folks learned a lot from the excesses of the est days and cleaned up their act considerably.