Are you seriously going to have an attempted rape scene for a fucking "a handsome knight saving a damsel in distress" bullshit? Are you kidding? Why not just continue with a plot rather than trying to force a shitty scene for love points.
Even if the guy did manage to rape her, then what? Blackmail? Bro, she's a fucking descendant of a hero and also a noble. With no evidence (having your dick smeared with virgin blood is not one), how can the guy even blackmail her? I get that nobles have pride as high as the skies above, but will she even keep quiet about it? Their pride won't let anyone, even another noble, to smear their name.