[ This is a really good observation on Kaeya's part, that maybe--just maybe--will be useful to Matt later. ]

Oh, [ he says, in the meantime, ] well--I sort of saw it? I did a scry with Xishen looking for her, and it turns out ...

Her physical location isn't really so cut and dry. But "she" is the sense I got, along with that information about Aions tethering her here. Estinien's not the only one, but I think his connection is one of the stronger ones, if not the strongest.