@Khott If we go by the first chapter, after her engagement they wanted to kill her on the way to the Dukes. For some political reason i can only surmise. So for her to leave with the Duke and alive was not apart of their plan.
Nah but she found out that it was the emperor that really set that up and he blamed it on the Duke. It was when the black haired dude told her about his disease and shit.