Ziva David is a broken woman. In Somalia, she had been ready to die, why did they have to come for her?
But now she has nothing left to live for, so she takes risks that she used to not take. Like with the big 18 wheeler, she closed her eyes hoping that she would go right then.

But, she did not. So, she just sits and waits for the next oppurtunity, not that she is suicidal. She just knows that when she goes, she will no longer dread it.
Ziva David is a broken woman, waiting for her time to come.