Day 6: 7:00 AM - 8:00 AM - S6-E2
Other mistake: At 7:45 Ahmed leads Scott out of his house at gunpoint so he can go to Scott's house. At 8:14 they arrive. But Scott's house is just across the street so we're supposed to believe that it takes half an hour to cross the street.
Other mistake: During the explosion from the tape recorder, there is a very short explosion shot recycled from a previous season (when Christopher locks Jack in a bunker and tries to kill him with a bomb placed in a clipboard). This old footage is also seen when that tape recorder explosion is shown on recaps of the event in season 6.
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.
Cubs Fan ★