I am not sure if it has been said before, but I too have noticed what may be a little mistake. On the page 4, diary entry from 7th January 1914, Olga mentions she breakfested with "Papa, Mama, Un. Boris and Un. Georgiy". The footnote at the same page says "Georgiy" was Georgiy Konstantinovich, son of Grand Duke Konstantin, but I think it was actually Grand Duke Georgiy Mikhailovich, who was quoite close to the Emperor at the time. Georgiy Konstantinovich in 1914 was still just a boy, so it would not make much sense in him being all alone, without his parents, at such a breakfast, plus Olga would hardly refer to him as "uncle".
Could that be?