Joan apparently was brought somewhere near the Sarangrave since the Skest and something like Landsdrop are mentioned in connection with her. Also, given the time differential she would have been in the Land at least a day before Linden arrived. We have no way to know where Jeremiah or Roger (if he's there) ended up.Sandy and the Sherriff were not on Kevin's Watch, and Foul did not acknowledge them.
By the way, why is Joan still alive? In the Prologue it states rather clearly that the lightning strike killed her. Even given a matter of minutes it takes for a body to actually die after the heart stops she should have survived only a few days in the Land. Unless someone is reviving her back in the real world with CPR or something?