I am not a juror but I wrote a book explaining why she was acquitted: https://www.amazon.com/dp/B079WKF7J8/ref=cm_sw_r_sms_awdo_t1_vaxREb8JZRFM1_nodl
The TLDR is that the media just told the story all wrong and it led us to believe that the evidence against her was more voluminous and one sided than it was. What actually happened is that Casey's father, the other last person to see Caylee alive, was just as strange as she is. He's also a compulsive liar and lied to the police about a lot of things, including his story of what happened the day she died. And then changed his stories multiple times. On the stand, the defense confronted him with all his lies and inconsistencies and he responded by pretending he couldn't understand the questions.
Just to clarify, I don't know if he had any involvement, but his weird behavior (and it was extremely weird) led jurors to question it. Cindy left Caylee home with George and Casey. The child dies and BOTH of them lied to police about what happened. The defense had a field day at trial with George Anthony and that's why she was acquitted