Thanks for the welcome
What induced her state I am unsure. Was it the events as described by Lytton coupled with her own culpability in the events? Maybe. But her current state seems clearly influenced by Foul or a raver or in some way such as happened to the Community of Retribution and to Joan herself previously.
Was what happened in her brief time with Lytton after TC's death the whole cause of her current state? I don't know. Perhaps everything happened in that one car ride. Perhaps something happened later. It seems that there are several instances where her behavior changes:
1-The Lytton incident--which seems to have simply left her in some sort of 'real world' mental imbalance
2- Some years(? not sure of the exact timing of this) later she becomes more vegetative which I believe Linden described as a very atypical state.
3- About 1 year prior to ROTE she begins to punch her skull in. This one seems definately influenced by possesion or some long reach of Foul. Hence the mysterious unexplainable freeing of her restraints.
I really have no clue what initially induced her state follwing the end of WGW. But, I feel certain that she is currently influenced by Foul, either directly or indirectly.
T