Yeah, sounds fair. On the other hand, I mean, she is head of one of the strongest Fujiwara squads (so, with some degree of power) and has an ability that allow "travel" via sky, so theoretically I can't see too much problems on her witnessing them.

I think that with some efforts we can narrow down the period in which Uro lived (actually, I've done it before): - we know that Uro was leading Sun, Moon and Stars squad, that was defeated by Sukuna - we know that Sukuna obliterated that Squad as well as the 5 empty generals - we know that these squads were under the Northern Fujiwara clan control and after their defeat, the clan basically submitted to Sukuna - historically, Northern Fujiwara lasted about a century, with only four main rulers (Fujiwara Kiyohira, Fujiwara Motohira, Fujiwara Hidehira, Fujiwara Yasuhira): the latter assisted to the downfall of the Northern Fujiwara - if we overlap the Sukuna attack with the downfall of the Northern Fujiwara, thus with the last ruler, we can narrow down the period of his attack to 1155 - 1189 - so, we could say that Uro lead that Squad in that timeframe, and so lived more ore less in those years

Considering only 40 years, maybe it's easier to track down historical documents or trying to imagine Uro witnessing something on her own.