In all honesty, I don't know how long Gabrielle (only her brother and the the King perhaps call her Gabi) would be able to keep up the pretense with the Knights, Asten, and Elena. For one thing Asten, as an assassin would likely notice even the most subtle differences in behavior, moreover even the Knights would eventually realize that the Prince is keeping to himself more than he should, and I expect that they would sooner, rather than later, realize something was off. Adela in particular might notice some key things, given that she has been a woman in a man's role for quite a long time.
However, I will leave such revelations up to the other players.

Moreover, even if you do discover it... is it really wise to leave the commoners "unattended" when they are on the brink of revolt?
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Also, question. In the war with Brumland, were there any battles fought in Westend itself?