Hey I have a crazy theory about Sayid's wife and I believe we are going to learn more about her in season 6.
What if Nadia after her scape from Irak join the Jacob's team like Bram and Iliana, then he went to London to find out something about Widmore and later she was saved by charlie as everybody knows. Then I believe she was dangerous for Widmore and thats why he order one of his man to kill her in L.A. Probably Widmore tried to kill Iliana too but he failed o_O!!
Yeah I know is f@#%$n' crazy