The only part in the diet I think she maybe went overboard on is the cheese, so no dairy this time round .but other diets she has done consisted of 800 calories and still didn't lose a ld where she used to lose unhealthy amounts of weight using those methods.
She does no excersise because of a serious back complaint.
Cheese should be OK -- it is fat and protein (perfect for CNS). I am an extreme endomorph (metabolically), so I hold fat and water ridiculously. I am also a vegetarian, so no meat... yet, I do CNS.
Full-fat cheeses, 1% cottage cheese, whole eggs and whey isolate are my primary protein sources. I use coconut oil, heavy whipping cream, and vegetarian omega 3-6-9 oils for primary fats. Start by keeping her fats at 50/50 with protein, and adjust from their, but don't go below 70/30 (protein/fat).
Also, get her bodyfat % measured (as accurately as possible / affordable). Find her lean bodyweight. Ensure that her caloric intake is BELOW maintenance. I know Keifer does not recommend counting calories, but in cases like my own -- when I was eating at or slightly above maintenance, even with LOW carbs, I simply stalled, and my weight maintained. Now, my fat is 130g a day (~30%), my protein is 220g a day (~70%), and my cals are at about 12x my lean bodyweight. Fat loss has begun again, in full swing.
So, in rehash... play with the macros, play with the calories, and ensure she gets adequate resistance training ea. week (3-4 days), with possibly 1 day of HIIT (for 30 minutes) AFTER a Carb Nite.
Also, ensure she fasts for 12 hours from finishing her final meal of the day. So... if she finishes dinner at 11:30pm, and she wakes by 9am the next day, have her throw back 16oz of black coffee, and then hold off her first meal until around 11:30am.