SHE HAS THIS. There's over one hundred assorted weird books now in a hidden nook of the Fortress library, from which Ione can also borrow books, there should be five old foreign language-books in there and Security has magical text-altering tools to work on the date, they just need literally three minutes and this will be okay.
(She has... not quite totally forgotten about how she doesn't want Cheliax conquering the world per se, but that's just letting her operate at the height of her job, the height of her game, without being so afraid of losing. Cheliax will not dispose of her, she thinks, if she fights her best and loses fairly; and if they do, there's always the Gardens.)