I agree. Without reopening the debate over whether AB should have known, should have seen his daughter, etc, as I do not want to drag the thread off topic.
I think it possible that while AB had not set eyes on Zahra for a while, she was still alive, tucked away in her room while some sort of abuse injuries were too visible to be explained away.
Whether the COD was a beating or injury which then became infected and caused her death or whether she was in there so bruises could fade and the fatal event ocurred closer to the time of her "kidnapping" I do not know. But I have long believed TOD is within 48 to 72 hours of her being reported missing.