if kei had gotten reborn at an earlier time (like during minato’s generation or the sannin or the warring states era) what would she have done?

cyb-by-lang:

Freaked out for a while, in the case of the first two. Then she would probably become a ninja again and do her best.

The Warring States/Clan Wars era would probably inspire Kei to Never Get Involved and move to another continent.