Personally, I'm kinda pissed that we totally got shortchanged on this story. Nadia moved to Irvine, CA, to work for a "medical research foundation" and Locke was the pest inspector for her newly purchased home. Irvine is right next to Locke's home city of Tustin, CA. The whole scenario was set up for us to see Nadia again, particularly after we saw her in I think "Greatest Hits" where Charlie saves her from being mugged in the alley. Or was that in "Flashes Before Your Eyes" and it was Desmond who saved her? Nonetheless, she continued to appear in various episodes leading up to what I think was supposed to be a great reunification with Sayid. I always thought she ended up working for Dharma.
We definitely got short-changed on this story and it pisses me off.
Nadia Cheers
*Des8