Ooh, back to 2160s, birth of the federation, with guest stars from Enterprise!
"I'm gonna send you back to a time when the mirror universe and the prime universe were still aligned. That's so you won't fall apart. Atomically speaking."
Could mean any time including at least 2150s onwards (with the Defiant), through to the 2370s (DS9)
Or maybe the years of the post atomic horror after First Contact. Perhaps around 2079 (the time of Q's tribunal mentioned in "Encounter at Farpoint").
She would very well fit in during these years and because of her redemption, it's possible that she's even the founder of what becomes Section 31, which may have started as a force for good
