There is an interesting dichotomy.
Dr. Garavalia characterized a "normal parent" who would always call 911 if they found that their child had accidentally drowned. She says this is always the case. The situation with Caylee raised three red flags that pointed to homicide and that is what she concluded in spite of the cause of death being uncertain.
On the other hand, many people would characterize Casey as being an abnormal parent and quite out of the ordinary. I think many could imagine Casey finding an accidentally drowned Caylee and then not calling 911. A call to paramedics means that she loves her daughter, wants to try to save her life, and wants her around for the rest of her life. But again, many could instead imagine her packaging up Caylee with duct tape, dumping her in nearby woods and saying that an imaginary nanny has her and won't give her back. When the body is found, blame is supposed to go on the nanny who obviously applied the duct tape.