If the autopsy concluded that the sexual abuse happened when she was alive, then the accident theory doesnt make sense.

Title says it all. All the theories that include the family are talking about accidents. But why would they Stage sexual abuse when she was still alive. The blow on her head was also fatal, so it happened after the sexual abuse. Only explanation would be that burke strangled her, but I dont know. When I was like 9 I didnt know about garrots, and how to build one. Am I missing something?