I Just Write The Thing: Anybody familiar with her older fanworks will recognize that Lady Norbert and this trope are old friends. She said this often during the course of the first two stories, along with the assertion that she was largely writing by the seat of her pants. Three Generals did follow a chapter-by-chapter outline, though some of the details still came as a surprise to her.
In the last chapter of Triumvirate, Roy makes a remark about Maes and Gracia serving "fancy tuna" at their upcoming wedding reception. This is a shout-out to Ouran High School Host Club, in one episode of which Mori (who shares a voice actor with Roy in the English dubs) says that exact phrase.