I think it has something to do with the fact that she told that her powers don't work on ppl who don't trust her, or believe her. Something like that, correct me if I'm wrong
But it worked on that guy in the cells and he didn’t trust her either. But as soon as she convinced this asshole of a grandpa marquis that she’s a double agent, she should have used her powers on him. The bitch could also be done because that girl is thick as two bricks and believes that she’s better than everyone and that’s her downfall. I just don’t get why she wouldn’t use those around the two of them to pry this information out in front of everyone and then use her powers to finish them off by making them admit it all…
She literally has the power to bend people to her will via her words. She could easily have them admit in front of everyone why they are there and to what purpose and have them admit to trying to stage a coup. All this feels so pointless since her eyes would literally solve all of these minor issues…