I wonder how long the Conspiracy will have lasted. It's unlikely that would have ended in Stephanie's lifetime. We know from the timeline that in 1569 PD, the Ninth Amendment is adopted and recognises the treecats as sentients and grants them a third of Sphinx. I'd love to see that in the SK books, but I doubt we will because by then Stephanie Harrington would be in her sixties and the SK books are "young adult." In fact, we're far more likely to hear about the Amendment in the Manticore Ascendant books, in passing as B-plot, because we also do get far more insight into the Crown and Government there.
So while the Ninth Amendment might have been a great triumph for the Conspiracy, I don't think it was the end. We do know from "What Price Dreams?" that at the time of Princess Adrienne's assassination attempt, the fact that treecats were empaths and telepaths wasn't settled, but it was not unknown either.
So when would the Conspiracy have disbanded, its work concluded? Maybe after the Gryphon challenges to the Ninth Amendment, some 50 years after its ratification (and after Stephanie had passed away), had been defeated?
Or was it after the assassination attempt on Princess Adrienne? In the short story, we are told:
What price dreams? ch 8 wrote:The descriptions of what it meant to be adopted had always struck her as maddeningly vague, incomplete, confusing. It had sometimes seemed as if all those fortunate souls were involved in some conspiracy to keep the rest of the human race from knowing what it felt like.
(emphasis mine)
And one of the actions King Roger II took right after the attempt was to change the Crown from opposing the Treecat Rights Bill to supporting it, and enforcing the Ninth Amendment. Of course, right after that, there would be treecats in Mount Royal. Would that be sufficient?
When did the Conspiracy clue in the Crown? It could have been during the Ninth Amendment discussions, but given that Roger II was opposed to the treecats, maybe not. Or was it right after the assassination attempt, the SFS personnel pulled Princess Adrienne aside and told her, "now that you've survived one conspiracy's attempt on your life, let me introduce you to another one, that has been operating for 100 T-years right under your family's nose?" Or did they never clue the Crown in?