All bets are off with this woman, so it's entirely possible the story will continue to get weirder and more unlikely before it's over. However, I have a problem with a detail that I think will be something of an insurmountable obstacle to the defense -- at least in terms of reasonable doubt.
If Casey sticks with this asinine story about the abduction, she's opening herself to conviction on the basis of the car. Assuming LE has solid evidence linking the body of her daughter to the car, she has given no version of this story that would explain how the "kidnappers" knew where her car would be when it ran out of gas. That's going to tip any normal juror over the edge. It's obvious that the defense wants to posture that someone "put the body in the car" after it was abandoned. The problem is that that someone not only "put the body in the car after it was abandoned," they also took it right back out again. Getting a jury to buy that she knew nothing about that -- that it all happened in the parking lot at Amscot after the abduction -- is not possible in my opinion. There's just no way they will convince them without solid evidence that the "kidnappers" contacted her after the abduction and before the towing. Of course, such evidence does not exist.