She actually didn't know about the proximity. She just knew that from his accounts, he got sick whenever she was around. Miranda assumed this to mean her cooking, and not her actual presence.

It's like a stab through the heart to hear that the family that both Bianchi and he came from was not a good one. Of course, she knew about the castle and the maids and playing for big parties and things like that, but not the details. "Y-Yes, Bianchi?"