Day 8: 8:00 P.M. - 9:00 P.M. - S8-E5
Other mistake: In the car Jack practises his cover story posing as a German arms dealer. But when he mentions his fake name Ernst Meier he says it in the English way, not in the German one. No man with German language knowledge would say it in this very wrong way, and it would give him away immediately. (00:22:05)
Answer: According to Jack in season 5, Nina was "deep cover" before the pair ever met, so it's safe to assume she was recruited before she joined CTU. As for what her primary mission was, who knows? Perhaps it was to gather sensitive intel and pass it on to her superiors. Given that she worked for an intelligence agency, it's not a stretch. Or perhaps we may find out in season seven.
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