Was Ziva kidnapped ? I think I missed an episode, help !

Hmm... our Ms. Agent David has not been kidnapped. I don't know if আপনি are referring to Season 6 when she decided to stay in Tel Aviv, went back to being a Moosad Agent and ended up captured in Somalia. But she was rescued in Season 7, episode 1 (which aired Sept 09).

last episode of season 6, aliyah. they had her in somalia and she did not appear to want to be there.