I'm the Villainess, So I'm Taming the Final Boss, Vol. 11 (light novel) — Sarasa Nagase

Villainess against villainess!The leaders of seven nations come together for an intercontinental conference to decide the new monarch for the Queendom of Hausel -- and the candidate is none other than the villainess of the downer game who Aileen and Claude went up against in Kilvas! If Cattleya becomes queen, Ellmeyer will have a war with Hausel on their hands. Caught off guard by this underhanded maneuver, Aileen embarks on a merciless diplomatic gambit, and Claude is prepared to protect his wife at any cost. Game world or not, Aileen will fight to protect her beloved family's future!