Also Dupree knows about & was dosed with Tarvek's anti-wasp potion, and ... probably knows whether Gil was as well, though that didn't appear on the page. Whether she thinks it worked ... no idea.

By now (after it was mass produced) she knows this stuff works. In that the war goes on and she has to know Wulfenbach troops and agents are immune (except the very few who were infected earlier and not checked by the Vespiary before Klaus stopped it).
About Gil, she «…never believed it. You’re just stupid [about Agatha], and that’s that».