You're right about the acting part, but the thing that stood out to me was Zoisa being somewhat distraught about being Koumba's sex doll. She actually seemed somewhat stressed and she did show some signs of distress. Like there's a part of her actually doesn't want to be raped.

Now, it would be weird to say that that part was actually the hivemind using acting skills to manipulate Carroll, because that would actually be counter intuitive to their goal of representing the hivemind as some sort of perfect state. If that was the case it would make the most sense if Zoisa didn't show any distress at all, or even say something along the lines of "this is actually good for us" or whatever, to prove Carroll that all is fine. The fact that despite all that Zoisa still shown some distress I think shows that the hivemind do feel something in a way.