Indeed, Olga was only telling the truth about AA. I think she would have accepted her as Anastasia, if she had been, and Olga could be convinced that she was. If you read Olga's biography, you realize she knew Anastasia relatively well, and had good memories of her. She was quite conflicted about Anna Anderson, indeed. But although Anastasia's appearance would have changed between when Olga A last saw her, and the time she saw Anna Anderson, ( if she had been Anastasia), then I still think that Olga A would have known.