why Casey Anthony got a "Not Guilty"

It makes me sick that casey anthony got a not guilty verdict she lied to the police that her daughter some of the jurers believed that she deserved to be sentensed to death and most people believe that she had nothing to do with her daughter's murder everyday when the news comes on i see cayle's face and still makes me sick every time i cannot forgive casey anthony for what happend to her daughter if i was an ada i would not offer any deal and i would see that she goes to death row it is as i said before casey's daughter would have had a long happy life if her mother had not killed her and hide her remain's since 2008 and i will never ever forgive her for what she has done.