[Szayel speaks up here, reiterating a bit of what the report revealed and what Miach has been talking about, with a few clarifications.]

As you all saw on the autopsy report, in addition to the fatal head wound, Dia also sustained injuries to her ribs and also had scrapes on her knees. It is difficult to tell when these additional injuries were inflicted, so it is possible that they were incurred during a slight struggle or when she fell after receiving the blow to her head.

Also rather curiously, we found a portion of white bedding wrapped around her waist like a sash, similar to her magical outfit. However, she was not transformed at the time we were investigating. Taking the fabric off revealed a spatter of blood and traces of dust. It is likely that it was wrapped around Dia in an attempt to hide the blood.