Another clue

"Damn…damn…damn…" Charlotte vented her annoyance by constantly pounding the pillow in her room. 

A few moments ago Anne forbade her to go with Christian. Even though she went to the villa owned by the Clarke family, Charlotte was sure that her relationship with Christian will improve. Charlotte wants to take advantage of Christian's downturn, that's why she wants to be by his side to support him. But her intention can't be realized because Anne forbids her to go with Christian 

"Aaaarrrrgggghhhh…."

Because all the rooms in the family mansion have silencers installed, as a result, no matter how loud Charlotte screams in the room no one would be able to hear it. That's why Charlotte dared to vent her annoyance by constantly screaming in her room, one of her old habits that can't be lost.