This is how I see it from what we know so far. I think DiMaggio was a person of low-average intelligence and maturity level (hence the attraction to a 16 year old). I think he was infatuated with a beautiful young girl who already quite skilled in the art of seduction. I think she was leading him around by his ________…I think they were romantically involved…I think it is possible they had discussed the murder well in advance of the execution. But I also think that 16 year olds thrive on drama, and can be very much out of touch with reality (especially in this day and age) and that it is possible that once the plan became a reality, Hannah could very well have been repulsed and traumatized by what happened. It is one thing to talk about it and plan it, and quite another to see it put into action. Hence the reason she could say he “got what he deserved”.

I think the fact that the dog was covered with a blanket indicates that someone at the scene had some feelings of tenderness for the animal. A cold blooded killer generally does not do things like that. A remorseful killer, or their accomplice, will.

Someone mentioned she reminded them of Casey Anthony and I was thinking the same thing. Her obsession with social media is one hallmark of a narcissist if not a sociopath. They love any attention, even negative. Casey actively poured over comments made about her on news sites and was also known to respond to some. It would not unusual for Hannah to be scoping out websites about her just to see what people are saying and what they think.
I hope I’m wrong and she is innocent but it’s not looking good.