Honestly I thought about it too. First of all, she is too deep in the moment with Asad. I doubt she is even thinking about her abbu. Its not even been a couple of hours since Billi left. I think she is enjoying the moment for now.
Next, I have a feeling that Zoya did not trust billi completely. All she knows is that the grave she thought was her father's is not. She may still be thinking he is dead since Asad told her and maybe she feels she just doesn't know where his grave is. Because Zoya did not really trust billi so she may still feel he is dead.
All these articles about her abbu IMO mean that Zoya will come close to the truth again but the only thing she may be able to confirm is her father is alive. I am quite sure that Raziya won't let her reach till Gaffur. Plus this is her 2nd attempt at looking for her dad. Going by the pattern of 3, I feel she will be misguided again.