Just speculating like everyone:(
I considered that someone could have just bumped into her, thought it was minor and offered to take her home - and when she passed out he/she panicked and dumped her in the woods.
We have to wait just three more hours for the facts.
God bless
A friend of mine died from a "bump". She was snowmobiling with family/friends and tried to get past a pickup truck that was blocking the trail head. The machine slid down to the truck, trapping her leg. I don't remember if it was enough to break the bone, but they'd gone to the emergency room to be sure, she was in quite a bit of pain.
She didn't live through the day. She died in the emergency room, not too long after complaining of a bad headache.
A blood clot formed in her leg as a result of the injury, and then moved to a more dangerous place.