Draco has forbidden Rabastan Lestrange from entering Malfoy Manor, and has warded it accordingly. Rodolphus comes and goes, but that’s mostly because Daphne is staying there with her parents, and they are still insisting that the rules of courtship must be followed, so he can’t see Daphne anywhere else. The Greengrasses would rather be at their own home, where they would certainly allow Rodolphus some unchaperoned time with his fiancée, but Daphne swears that if they try to take her back there, she’ll run away like Astoria did. Nobody is really sure if Astoria ran away or met with foul play, but Daphne is using her parents’ fears to control them. It’s all she has.