R > If fat only comprises 65% of the diet then 35% is made up of  
carbohydrates and proteins.

Sorry, I didn't communicate well that this is a low carber and she is  
assuming therefore that very little if any energy will be derived from  
dietary carbohydrates.

R > Much of that 35% will also be burned as glucose, as excess  
proteins are converted to glucose...

Yes. Her point is that is you are getting at least 65% of your energy  
needs from fat, there is not sufficient protein remaining to be able  
to "kick you out of" ketosis.

R > While the body may be using mostly fats for energy, it will use  
some glucose as well. It isn't an on or off thing. It is a question of  
proportions. Typically, the more fats that are consumed as energy, the  
deeper the level of ketosis, but that also varies from one individual  
to the next. My wife and I can eat identical meals for several days.  
She will reach moderate to deep ketosis (40 to 80 mg/dL) while I will  
only experience mild ketosis (about 15 mg/dL).

I did not know that.  Interesting.  So if even a tiny amount of excess  
protein is consumed, glucose is produced (rather inefficiently) via  
gluconeogenesis which the body will burn preferentially, therefore  
reducing ketogenesis?

Jim