^see official preview linked above. She's explicitly stated to be Retainer's human disciple, hailing from an unspecified clan of exorcists (your guess is as good as mine if that means some connection to Popsicle BoiChongyun). Apparently not much for aging these days between cultivation hijinks and Adeptus magic, which probably goes ways to explain why the superstitious hoi polloi tend to take her to be one.
Then again, that hilariously obvious fraud Archaic Lord of Lightning and Thunder or whatever his bullshit title now was evidently manages to make a living by scamming rubes with his self-proclaimed Adeptushood so one rather gets the impression Liutians might be culturally predisposed to some uncritical jumping to conclusions in such matters anyway...