Why are you thinking the princess would be rape? It's an european setting, you Don't rape nobility, especially princess…… And we see that the king punish rape with Pauliana…..
I think it's more related to the belief that nobles are allowed to kill themselves and win some honor for it, like roman...
But i don't know, she was just raped during weeks, i don't think its understandable that her will for revenge is stronger than the grudge she have against the prince and his country
" I see how you are frightening, that's why I exile you. You will have a reason to try to kill me"
Stupid again, a nobleman will try to gather talent for his household, not exile them. If he wanted to create grudge in his succession, he did it