Caseys reaction to her father IMHO is acceptance of dissapointment. It's possible that George may have been the only one who held Casey accountable for her actions while she was growing up, and could be the reason why she had such animosity towards him in her conversations with friends. If he disagreed with her actions, then she would "get him back", with stories of how "horrible" he was to her and to the rest of the family. I do not think that Caseys feels bad for what she did to Caylee, but I think she feels accountable for the disappointment that George feels about her.