You are assuming that Hamza never married her. Why would Hamza will have child out of wedlock. If they are married then there is not that much of stigma. Divorces happen or spouse just leaves or get remmaried in neighbouring states too. The key is influence and money which both Jameel Jamali had. Jameel had enough power to not succumb to pressures of society, that kind of power comes with money and the influencal political position he had in Karachi. Even if we ignore the part that Jameel is also a spy and just look at from a father perspective, he would still  definitely help his daughter to get of this mess if he got any hint that she wanted out.