Responses
I think Karina wasn't officially related to the Duke's family but someone he was sponsoring because she is a 'reincarnator'.
And she believes she is the long lost daughter because its mentioned in a prophecy that the last reincarnator is the daughter of the emperor, but Karina is actually a fake reincarnated. Which is why they tried to kill off Rossite at the start
Maybe this is brain fog, but was the Villainess/Karina raised as the daughter of the head of the house/count/noble dude she and the FL used to live in?
Or as his niece?
I'm just confused how we got to her thinking she's the longlost daughter of the emperor?