Coincidentally, the kozuki clan has also been associated with a similar "Crescent moon" symbol throughout the story, and this might give a subtle hint that she already had a link not just with wano but also the kozuki clan before she even went to wano in the first place possibly 800 years ago as well. And not only is she linked to the void century and wano, but she is also linked to roger, and given that she came with oden to roger's crew later on she's definitely one of the people who knew the true history of the world, like roger, rayleigh and oden.
Perhaps she may have even compared what she had witnessed in the past, to what was also written.
What could lady toki's purpose in the story be, 800 years into the future?
What could be her motive to go to wano 800 years later? Perhaps she was asked to, maybe it was her home? Why 800 years into the future?
Another thing to note is, oden decided to open wano's borders before he returned to wano; he met lady toki before joining roger, and knew the true history during his voyage. Could lady toki somehow have partly influenced oden's decision to open wano's borders?
