This right here is very telling, at least to me...
Something happens to Caylee here, most likely accidental...and the frantic phone calls begin. Call dad, no answer. Call mom, no answer.
I frantically make phone calls when I REALLY need to get ahold of someone. I'll call non stop a few times until I can get ahold of them, or realize they're not able to answer the phone.
She most likely freaked that she couldn't get ahold of anyone, and rather than call 911, she panicked, and tried to hide that sweet angel.
No calls until the next day...
Hmmm, being the social butterfly she is, it's hard to believe she didn't call anyone from 7:30 until the next day. Pretty obvious she didn't want anyone to know what she was doing or where she was going.