I hope some can understand my train of thought here. If Casey actually thinks Caylee is in danger if she "talks", she will sit in jail and keep her mouth shut instead of endangering her daughter. JMO.
I can understand why that lady did what she did, as a court ordered her to let the husband see her child and wouldn't believe the child was being molested. She put the child into hiding and ate the jail sentence. So, yes, I can understand this.
In Casey's case we haven't seen a claim that a court has ordered this for her baby. As far as I know Casey could tell LE about what she suspects, where Caylee is and have Caylee checked. If it's true, somebody is in trouble. If it can't be proved Casey could move away with her child, she's 22, and there would have been an explanation to all that has transpired.imo