I don't think Cindy was covering for Casey, I think she was just in total denial that Casey could have killed Caylee. When you think about it, that's hard for a lot of us to grasp, that a (supposedly) loving mother could kill their own baby, whether intentionally or accidently. I really believe the Anthony family has YET to come to grips with that, but even if they do accept that she did, it will be very difficult for them if she gets the DP. I have tried to put myself in their place a thousand times, and it's just very hard to imagine how I would feel. I really don't think they are thinking about justice for Caylee right now, their focus is on trying to save Casey from the needle. They will never, ever get over losing Caylee, but Casey is still their daughter, and it's not an "either/or" thing for them. They love them both.
JMHO