I agree with your last equation wholeheartedly...exept for the brunette Camilla on the end. I think that should be Camilla Rhodes (the REAL one with black hair). Maybe that's your view also and by brunette Camilla you mean Camilla Rhodes. I don't know.
As for Carol, I do think she's a transition from blonde Camilla Rhodes in the dream to Camilla (the lover of Diane in her daydream / fantasy).
Siku, do you also think that the structure is dream / daydream / reality and that each segment is coming closer to the truth?