Not trying to be morbid, but something has been tickling the back of my brain since last week's hearings.
Libby and Abby's neck injuries were described as being vastly different in severity. Libby's was severe and she was described as moving from a standing to a sitting position. It was implied she bled out fairly rapidly. Abby's was described as being a small cut on her neck that caused her to bleed out
slowly. But it was also theorized that she hadn't moved much at the time of the injury due to the blood pattern on hoodie and face.
Obviously they didn't go into any other injuries at last week's hearings, so we don't know about any ligature marks on ankles/wrists or blunt force trauma (unless I missed that?).
But to me the combination of a smaller neck wound with a long time to bleed out combined with little to no movement during that time makes me suspect that Abby had been rendered unconscious prior to receiving the fatal neck cut. Otherwise, there should have been significant movement in the longer time it took for her to succumb to her injury. The instinct would be to clap her hand over the wound--and if her hands were tied but she was conscious, there should be evidence of a struggle against her bonds to do so. If her hands were free, she grabbed the wound, and her hands were washed post mortem by the killer, I would expect there to still be trace blood evidence under her nails and in her cuticles since the murderer sure didn't take a nail file to clean under them.
Sadly, I expect that when the autopsy reports come out at trial, there will be blunt force trauma to the head to quickly render her unconscious. A hard blow to the head of a small girl with a gun by an adult male would do it. Strangulation would take too long and would make it impossible to keep Libby under control while it was happening.
I wish my mind didn't work like this/go down these paths, but it does.