IMO, I think parents take so much, and all have a breaking point. I have my doubts they would ever let her back into their lives. By herself, she has managed to take the one thing that meant the entire world to them, Caylee. It would have been bad enough had ICA taken Caylee away somewhere and never left them see her again, but to kill and destroy this beautiful, innocent little girl that their world evolved around, I don't feel can be forgiven, even by ICA's parents who once loved her deeply. I believe that you can only be hurt so much and beaten down so far, that you no longer care.