pretty incredible story (this kind of story is very rare). i'm curious what her diet was like before she made these changes. (although it's pretty clear she had some kind of weight disregulation from an early age, and her mother does too, and i'm guessing a lot of it was due to the unhealthy SAD)
eating a certain weighed amount of food every 3 hours sounds miserable. it's interesting that the doctor's note included 'don't tell anyone what you're doing,' i think there is a lot of truth to that. the more you 'preach' the more you make yourself accountable to others, the more you put yourself in this 'diet' mentality, rather than 'lifestyle change' mentality. and other people, whether consciously or not, will try to sabotage you, because people hate it when other people try to improve their lives somehow (especially when it comes to diet)
also, 'don't drink sugary drinks' seems obvious to me, but i suppose if you grew up drinking soda instead of water with your meals it becomes a habit and you really do need to make a conscious decision wrt that.
although they don't mention the details of her diet, based on what little they do say, i don't think it sounds healthy... it seems more focused on low-cal and low-fat rather than 'high-nutrition/real food' (yeah it mentions fruit but not what the bulk of her calories are coming from)