User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-32599925-20170908002630/@comment-32599925-20170913234455

In the material in which it occurred, she appeared in our time's recent history.

I'm not exactly sure whether it was before/after 2000, but the event that inspired her Noble Phantasm would've happened before/during 2003 if I had to guess. I say it that way because that event killed that version of her, while this version found a different conclusion. Neither are considered to be canon as far as I know.

She isn't related to any actual historical event (thank goodness, or humanity would be for all intents and purposes gone-her NP is at a world-effecting scale at full power); rather, I did mention that she could be featured as part of a collaboration.