Did you hear the tape when Cindy called the police that Casey was missing? and panic or not loving family members do not just drop off their child in the woods, but would have buried her at the very least, fear of being found out would have certainly caused them to hide the body...not leave it in full view as was done....and certainly not just a short distance from their home. But I can see Casey clearly doing such a thing. She would not take the time nor the physical effort to bury her daughter.
she let her daughter rot in the trunk of her car until she was forced by the smell to get rid of the body.