From what I have read so far, I have come up with a possible scenario. I would like your opinions. This may or may not have been a planned murder with more than one involved. She was hit on the head knocking her unconscious . She was placed in the passenger seat to transport her and her car together. A limp body would not sit up in a seat, so the seat was reclined. Also the seat reclined would keep her from being seen. A getaway vehicle led the way and pulled onto the small portion of road in front of the gate. The other person following behind pulled onto the road and up the hill as not to block the getaway vehicle. Keep in mind everything is going fast, adrenaline is pumping, they are moving faster than they can think. Her phone is disabled and thrown, she is moved to the drivers seat, seat reclined like the other side because she wouldn't sit up being limp. Not necessary but probable being they weren't thinking properly. She and the car was doused with accelerant, she was reclined and it would get in her mouth and nostrils. The car was lit on fire and they took off in the get away vehicle, which may have had loud pipes. It was probably not the intent to burn her alive, but just a not so well thought out plan. Remember adrenaline is pumping they are in a hurry, she wasn't moving, they just burned the evidence. Not thinking to finish her off first. It could have been a heat of the moment blow to the head, which seems probable being it doesn't appear to be well thought out.
That seems to fit the evidence that we have so far. What do you think?