I have always believed that Caylee was dead, and that Casey is responsible for the death of her daughter.
I previously thought that Caylee's death may have been an accident, but after reading the documents released yesterday, I believe Casey intentionally murdered Caylee.
Casey is a sociopath, and even Cindy has acknowledged this fact. Cindy was in counseling prior to Casey and Caylee disappearing, and no doubt she had come to the conclusion that Casey was a sociopath after discussion with the counselor.
Sociopaths are very good actors and actresses. They are always playing a role, and prey upon family and friends to fulfill their needs. Lying comes easy to sociopaths, whether it's to feed their narcissistic ego, or to excuse their behavior. It is clear after reading some of the interviews that many of Casey's friends were duped into believing that she was a doting mother with a responsible job. Casey went to extremes to maintain that picture.
With her family members, it's clear after reading Lee's interview that the family suspected the worse from the very beginning. They feared Caylee was dead from the moment they smelled that car. Amy's interview, in which she relates the conversation she had with Cindy in the car on the way to pick up Casey at Tony's apartment, further supports the fact that the family believes Caylee is dead.
At this point the Anthony family is facing the prospect of their daughter being charged with premeditated murder. They live in Florida which has the death penalty, and this will likely be a death penalty case. I believe this is the major factor in the family's denial of their granddaughter's death.