It's been SO long since she was turned, living with the count for so long she may have developed feelings for him. But if she stays in her young form like that he'll never see her as a woman and she knows it. That's probably what HIM's talking about.
The more and more I research HIM, I don't actually think he's a bad guy. He just thinks he needs to act a certain way because of his position. He used to be much less serious back in the original PPG days. I guess the world ending and Hell needing new management changed him over time.
Ooooh! We live in the Highlands with our kilts in the wind! We're the Tartan Army, come join us, my friend! We look so dandy, jolly, and bloody right! We wear tartan because of our Tartan Pride!