Regardless whether Marie intervenes with the otome game world or not, I have a hard time imagining Livia interacting with the 5 idiots in a way that would in being their love interest. I mean, slapping the prince across the face, or pulling a guy to a deserted part of the library and forcing a kiss on him, but later acting like a damsel in distress when confronted by Ange. It's true that Marie drove her away, but if she couldn't stand up to Marie, daughter of a noble in debt, I think she wouldn't have the courage to raise a hand against royalty. Unless Livia thinks and acts like an otome game enthusiast, the kingdom is doomed.