After Ciel took over the family business of doing dirty work for the queen he started to admire you. He was even a bit jealous. You were the first daughter of your family. But because you were a girl, you wouldn't ever take over your family's business. And that makes you bitter towards your elder brothers. And so they sent you to boarding school. Exactly where Ciel was

It must be nice.. not having to take over the family business. He looked mentally exhausted