They never showed once that how can she lived without Kabir, it looks like for Zara spending her life with Kabir is not an option.
This makes me think that she is debating with her self that what she will do after loosing her identity, and like they said, Allah is just testing you and he will give your favorite thing back to you once you pass the test.
If they divorce then she will loose kabir... but if she will loose her identity then Kabir can give it back to her...
Kabir is the one to ask her to resign from SB, he even told press that she is not going to take her resignation back... and in future he will ask her to take resignation back...
According to me he can not ask her to resign if he wants to divorce her... like you are taking away everything from in exchange of your marriage and then you will even take that back from her as well by divorcing her... Kazi is right by not accepting her resignation, he should wait till this divorce drama ends...