I feel so sorry for this woman. She has not done anything wrong but she is being punished as surely as if she had been there that night helping in the murder of her grandchildren. It is one of life's unfair backlashes that the families of the wrongdoers suffer thru no fault of their own. I think she is just doing what she has to do in an effort to save her daughter, but she seems to have lost a lot of steam. My guess is that she knows deep down that hope is gone.
As for calling people liars, I am thinking that stems from the many things the authorities get wrong in cases like this. There are always things misinterpreted or misconstued. They aren't central to the issues though but often terribly important to the players, esp if you feel it puts you or yours in an unfair, unkind light. Maybe even unjust light. I suspect she is referring to the state's overall view of Darlie...the selfishness, the materialism, the ostentatiousness , etc. She probably honestly sees Darlie as kind, gentle, generous, loving, etc. I am sure that is a side of Darlie as well. One that often gets overlooked due to the nature of the crime, but there appears to be some evidence that she was also selfish, materialistic, tempermental, etc at times. Mothers have a tendancy to overlook such flaws in their adult children if they don't see them very often. I think that is probably what is going on with DK. What people say about Darlie is contrary to her perception of her daughter, her overall experience with Darlie. I don't find DK's attitude unusual at all. In fact, I can even relate to her.