I'm not sure about this? During the car journey, GCC says, "Sister Wang Zheng, do you feel alright? Are you not satisfied with the doll......or" and she says, "I am fine." So I thought she was using the doll but still needed to be well-covered up (or Zhu Hong had covered her for propriety/to stop Lin Jing sniggering).
In ep 10, we see that there is a Wang Zheng look-alike doll! I had simply underestimated Zhu Hong's skills with make-up.

Another point: given that Zhu Jiu gives that rallying speech to the You Chu, does that mean they're sentient? I'm curious about the line between people and monsters and how blurry it gets.
They can definitely listen to orders, so I think they're at least dog level, likely smarter. I'd actually be really interested in a fic investigating this/complicating the matter!