I'd frame the plot as a psychological study in reverse courtship. Her mind is a fortress of preconceived notions from the novel she read. The plot is the siege of that fortress by reality, led by the duke's consistent, confused affection. Each chapter is a new tactic in her defense (a divorce scheme) that somehow leaves a gate open or a wall compromised.
The supporting cast acts as both comic relief and siege engines, constantly reporting back to the duke about her 'wonderful' qualities. The eventual culmination isn't a dramatic battle but a peaceful surrender—her letting go of the fear of a fictional future to embrace a real present. The external conflicts are just the noises of the siege, dramatic but ultimately secondary to the quiet change happening inside the castle walls.
My final piece of advice: if you're going to read on Yonder, pace yourself with the daily free passes. Don't get sucked into buying a bunch of coins on impulse because you have to know what happens next. The story will still be there tomorrow. Treat it like a daily treat. It makes the experience last longer and costs nothing. That's how I manage my addiction to these serialized novels without going bankrupt. Find it, add it to your library, and visit it once a day. It's not so bad once you get into the rhythm.