Original: She is bothered by its proximity to the Count's chambers: it seems he has been making advances toward her and plans on exercising his "droit de seigneur", the purported feudal right of a lord to bed a servant girl on her wedding night before her husband can sleep with her.
Simplified: In the old days an important person such as a Count had the right to sleep with a servant girl on her wedding night before her husband could sleep with her.