A terrorizing incident in which there is pain causes an involuntary release of "fight or flight" chemicals into the blood stream, and possibly other hormones within the body that will contribute to a state similar to PTSD in a toddler that small, who has no means to process such an incident. She can't talk about it, receive talking therapy, or explain how she feels afraid when she hears similar noises in the future. It's possible these teens were even her half-sisters or cousins, and she will be exposed to her abusers repeatedly. This amount of fear is enough to induce a state of depression, which the brain can then make permanent through repetition of similar sights, sounds or environments where there is a sudden sharp pain followed by a lack of comforting as she reaches out for help, like what happened in this video. Children are not toys.
I understand MarkTwain’s cool headed approach to Justice...but there are limits and this case is an example. This is a case wherein a message must be sent not only to the malefactors but to all watching. The charge here should be as heavy as possible.