HR is not going to argue on a call like that, so the viewer will always see a one sided account. The decision has been made, and not by them. They likely do not even know or have access to that information and are given a list and told "fire these people today." She could have come to work drunk, and you would still not hear about it on a call like that. I don't like it either, but it is the way things go at big corps.