Finally all caught up after a day away. Now, here's my theory (and of course it's all MOO and pure speculation based on everything I've heard and read, here and elsewhere)
Timeline and time of death still not really known yet but here's what I think happened: (if any of this is off limits, please snip or delete)
At some point, a local person (possibly one of the teens known to her) lured her into the woods where she was not supposed to go. Of course she went, because she trusted him. There was no need to carry her, she went willingly. Not sure if there is a fence back there at the property line but if there is, the local teens know exactly where to go to get through, so that's where they went. Through the woods, across the creek (mud #1) and whatever happened, happened, and that's where she was left. Back through the creek (mud #2), through the woods and back into the park. Left purposely where she was because it was closer to the homeless camp reported to be there, than the park itself (to throw off suspicion) and also not taken any further than the back woods because no access to a vehicle to leave her elsewhere. It wasn't planned, just a spur of the moment thing. This person is local, knows the park, knows the woods, knew Jenise and is now among those openly grieving about it to their friends.
Of course, I could be so far off base I might as well have said it was an alien. But I don't think I am.