Wow, that was quite a showdown between Micchone and the Governor.
I guess from Andrea's point of view, the Governor is somebody she's come to like and trust and she's having a hard time digesting what she's seeing. The guy was beaten and wounded and having a complete breakdown; he had an answer for her about the heads, weird as it was, and the thing with Penny would be no different than Herschel and his wife as far as she could see at that point. She will no doubt come around in the next episode, but she really is a sucker. I wouldn't miss her if she's killed.