What would I have to gain from such a reveal? Truly that knowledge serves best as a trump card, doesn't it? The threat of a reveal more valuable than letting the knowledge become common. What would you do, I wonder, to keep it a secret?

[The true answer is: no. She did not reveal Flayn's secret back in the academy, and she does not intend to do so now. However appearing soft, even in this place, is a frightening concept. She is outnumbered, and with the paltry weapons to wield here? Outmatched. In a conflict here Edelgard would be crushed within the blink of an eye.

To make things smoother for everyone she has decided to (mostly) isolate herself aside from brief encounters, and edged words like these will help her stay that way.]