>>26961Soleil is closer to utopian than dystopian. It's natural that she didn't appear to have power: the first episode started with her 12th birthday, and Yuki was informed she'd have to start attending parliament. The advisors had to run everything during her childhood, and they were too slow to realize that time was ending. The fiasco at the border was what woke everyone up.
Now the advisors know they screwed up and hiding things from Yuki creates an opportunity for some rival to accuse them of treason.
A mature, badass Yuki could've seized real power at any time due to the absence of a strong, ambitious chancellor, (even Layla really just wants to be a mommy) but due to that same absence, the gaggle of lackeys they have there can't do much more than rely on teamwork. They know it, too.