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I was under the impression that it wasn’t Victorian London, but The Plague Year. IIRC she, canonically, brings a blanket infested with plague lice from here to there, and ends up dropping it next to the ship Catriona, which is how the Catriona plague actually gets started. It was one of those “oh shit, yes, that explains everything” moments for me when I first read the books.
She does also extremely briefly travel to Edwardian or Victorian London (I forget exactly what year it was). It’s mostly depicted through a newspaper clipping from The Sun and a rebuttle from another newspaper calling out their quoted witness for trespassing and strongly implying he was inebriated at the time and being an unreliable source. It’s quite comically written really
oh yeah, it’s been a while. details at foggy.