
I'm not really the fan of the FL. I think the Queen Mother tricked her into this mess. In the drama genere this thing will be the death sentence for her, because no noble lady can be the "perfect spy" without proper preparation.
And than - when she heard that, the duke didn't like her, she thinks he betrayed her - but she already betrayed him! She is the "spy".
I know, this is a romance story, but if it wasn't... well, this story would be really short.