There was no testimony about Valessa's mental state, but clearly she is not cuckoo. Her brains may be fried from all that dope smoking and acid dropping. Still, she cried at all the expected moments in court. If a teenager is going to commit this almost unimaginable crime, it's not likely to be a daughter. When it comes to violence, gender still matters.
Boys hurt others.
Girls hurt themselves. Most of the time. Your mother gave you life. If she is the only parent around, she is your ultimate authority. She can provoke in you love and hate and both at once, as well as awe.