What evidence is there that Nurse Ratched has reasserted her control of the insitution? Any evidence she hasn't?

Nurse Ratched has reasserted her control over the institution in Chapter Twenty-Three, again a mother or a warden who dominates the men. She speaks to them in utterly condescending terms, even referring to them as “boys” and treating them as children who cannot accept any sense of responsibility. Having treated these men with such great disrespect and taking away something of value to McMurphy, she triggers his anger.