
From what i read from the novel the duke doesn't fully trust her at first since many fakes came by so he and the brother test her not a lot of reactions are displayed until the coming of age ceremony and one time when Reynold thought penelope pushed ivvone and was upset but yeah if you want I can explain the coming of age ceremony

So one the day Derrick was mad since Ivvone wasn’t invited he was still upset because on his coming of age ceremony Penelope was like announced so he thought couldn’t they do the same (stuff like that) so he took ivvone to Penelope’s coming of age ceremony and announce her return. The Duke didn’t invite her because he didn’t think it was the time to announce it because it’s Penelope’s day to shine. If I’m not wrong Reynold was mad a Derrick
I NEED SPOILERS RN BECAUSE I CANT WAIT DAYS FOR THE NEXT UPDATE WHAT GONNA HAPPEN