The prosecution are focusing on rebutting the evidence that FS has very low intelligence and high compliance. They seem to be focusing on ensuring that the jury know she is mentally culpable for causing or allowing, and present evidence of her conscious decision making in ways to deliberately neglect or harm Star, or hide her from people who could protect her. I think the prosecution don't have much hope that FS will get murder or manslaughter.
The closing speech has been extremely harsh on FS, I hope it is equally harsh on SB. She was the main abuser, the groomer of a borderline learning disabled teenage girl, the batterer of baby Star, and the murderer.