Serbian goverment and delegation on head with Nikola Pashic visited NII in April of 1916. Had conversation with Emperor, and I doubt Olga knew for that converstaion. Even if she knew, she was quite, possible, or Nicholas didn't tell to her. Or even Pashich planned to give proposition, but I read his lines about that, that it would be nice if Olga became Serbian Queen. Also, Helena (Alexander's sister) was married to Ioann Konstantinovich, and called for Alexander to visit Russia, while Olga was nurse in hospital. Rest are rumors....
More later....