Then what caused her to call 911 in the first place? Power trip? Surely she knew she would be sentencing ICA to death by calling if she knew what was going on!
Do you have children? If so, do you think if you were just casually going along with your day, and you stumbled across proof your child was a killer, do you think you would be able to immediately accept that and deal with it?
IMO, not only did Cindy have to deal with her daughter being a killer, she had to deal with her granddaughter being dead. I think Cindy has practiced a lot of denial about ICA over the years, and it was pretty easy for her to slip into it again.
I think her mind started blocking all this out pretty quick, and I think by the time she started looking for ICA, she had already made whatever excuses and justifications necessary to convince herself she had been wrong.
IMO, this is backed up by some little things that happened. When she found ICA, she didn't ask her if Caylee was there, she never looked for her there, it was like she knew she wasn't there. When ICA claims kidnapping, according to Lee, Cindy's first words were, "What have you done?", to ICA. ICA told her she went to pick Caylee up, and no one was there and she couldn't find her. ICA never, to my knowledge, said anything at that time about Zanny stealing ICA's car, yet when Cindy makes that last 911 call, she refers to the car smelling like it had a dead body in it. IMO, these were all little cracks in Cindy's wall of denial that she didn't even realize were there.
AFTER the third 911 call, when LE finally arrives, Cindy is telling the officer, not all the details of Caylee's kidnapping, but arrest my daughter, she stole my credit cards and here are the receipts to prove it. Seriously?
I could go on and on , but the bottom line is IMO there was just way too much bizarre behavior on the part of Cindy for me to think she didn't know by the time she was back at the house with the car.