I'm not sure that information would really help much. If we assume that what the family and neighbors say is substantially correct, then a scenario becomes a real possibility, taking into account the events that happened that morning as per various accounts.
As I said before, IMO the circumstances are most consistent with a situation where an individual or individuals came looking for someone, did not find them, and took HB instead because she was connected to that person and was physically there at the time.
So, what would be consistent with that? One scenario is that this individual/s were angry or offended by HB's boyfriend, enough so that they would go looking for him right away. In this scenario they would have heard through the grapevine that the boyfriend was planning to go hunting on Bobo property that morning, and they would have assumed that meant the forest near the Bobo's house. So they went looking for him in the forest, but didn't find him (since he was actually on the grandmothers property). If they believed that he was on the Bobo property, but wasn't in the forest, the next logical place to look was the Bobo house. So they walked over there and encountered HB as she was leaving. Knowing that she was the girlfriend of the guy they were looking for, they would have interrogated her. So, a lot of angry questions, some of which may have resulted in the "Why? No." response. When they didn't get the cooperation they wanted, they would have smacked her around some. That would have resulted in the scream and the blood. Then, realizing that the boyfriend was in fact somewhere else, they took HB with them back to the forest (and presumably their car) as a bargaining chip to get the boyfriend to come to them. Initially perhaps it involved one individual looking for the boyfriend (perhaps on orders), and then drawn in others when she was taken somewhere else for storage while they figured out what to do next.
But then the Bobo's called in LE, the story hit the news and at that point they realized that she had to be killed to cover it all up, otherwise the individual/s would be going to jail for a long time and they knew it. In a scenario like this, other people may have known about the dispute between the boyfriend and the individual as well, since someone would have had to tell the individual where to find the boyfriend (Note: the boyfriend himself may have been completely oblivious to the trouble heading his way). Once the case hit the news rumors would have started up very quickly locally, and that is apparently what happened. In this scenario, HB's brother would have been completely in the dark as to what was going on, but the mother may have had some inkling that trouble was brewing around the boyfriend from conversations with HB.
So, a completely unplanned spur of the moment event that resulted in HB being taken and eventually killed basically because she happened to leave her house at the worst possible time.
IMO that is a scenario which should be considered to explain the events of the day.