This just makes me more and more and more sure that Janis IS Olive.
Janis is the grand abbey, so theoretically high level.
Janis is powerful and presumably could be in high demand, but we've never known her to leave the MK- because she's terrified that Jillian will kill her.
Janis' name invokes a musician, Joplin; Olive was a musician.
Janis is involved in the conspiracy to kill Charlie- Olive hated him for some reason.
They are definitely drawn within the realm of signamancy shift.
Janis is involved with the second SPW spell. Olive was clearly involved in the first- the first thing Judy does is go kill the witch, with Olive's help.
Janis wants to break the world to bring peace, since she knows that the rules of erfworld demand war. Olive experiences this herself- she generally tries to win out of attrition or deception or absorption rather than violence, but then also, out of necessity, has to disband down to a skeleton crew to make the upkeep work. She can't bring peace to the world without conquering and then disbanding it.
"She then used them to infiltrate Westeregg and destroy Blair, capturing the Arkendish and returning it to The Wizard, as per their terms of alliance." Olive has always seemed sort of oddly sincere, if obviously psychopathic.
My working theory is that Charlie sent Judy to go kill the witch, but told Olive, who was at the time pacifist, to go with her and use her power to make it a clean theft. No fighting, but you didn't need to if you could move at will and couldn't be engaged.
Being manipulated like that to take place in killing infuriates Olive, which is the start of her descent into insanity and eventually her betrayal of Charlie- especially if Charlie was already starting to move towards his mercenary-state, cut-throat, cause chaos to get paid to fix chaos MO.
Now Charlie has the dish and Olive, and Haffaton has Judy and the shoes. The REALLY interesting question here, is how Olive gets to Haffaton's side, how Judy is put in a position to kill but ultimately spares Charlie, and what happened to Doothis that Judy becomes the overlord of Haffaton. My thought is that Olive invites Judy and Doothis over for chocolate, turns to Haffaton attempting a coup, Doothis orders Judy to kill Charlie, being game for that sort of thing, but Judy doesn't and Charlie kills him, making Judy who happens to be heir the new overlord of Haffaton, over Olive.
But what doesn't jibe with that is.. why doesn't Judy just take Olive home, then? Why does Charlie just leave with his dish? Maybe Judy was also really fond of Doothis, and so the compromise is, "I won't kill you for killing my ruler, but you better get the hell away before I change my mind." Maybe, maybe, maybe...