They mention 2 of the 8 divine treasures and then show a ... woman I can't recall ever seeing alongside the swordshota we know.
Am I remembering something wrong or have we never been introduced to her, but we can assume she belongs to one of the 2 isekais we're not familiar with (not counting the one that seems to have taken over Domino) ?
The main question for the situation is simple.
Does she want to take the throne ? If she does, problem solved. If she doesn't, oh well, no chance unless you want to ruin your cause.