It is only about 2 months until we arrive at the mile marker of "10 years since MB was murdered," so as we near that milestone, there will be a chorus of articles and TV docudramas and news "reports" on this case. If the past is any guide, in the middle of all this, LE will offer some vague "working hard" and "new eyes on the case" and "it's not a cold case, we work on it constantly" type of comments. I'm not saying those would not be true, but rather that none of it would be all that informative.
The last P/C where they answered questions to the public was about a month after the murder, when they revealed the video of the car at SWFA. But they have not been unilaterally offering any details of what they might have discovered. At that point, they said they had no real answer to whether the killing was random or not. They didn't say anything about how MB was murdered. (They were going to tell us more later, after the autopsy, supposedly, but never did. ~Ahem~ Will they ever?)
Personally I doubt MB was targeted. Part of that is because if she was targeted, that means the killer knew her, and that limits the possibilities to investigate. LE can sift through her life, figure out who she knew, and then investigate from those people who fits that possibility, and who would have been wanting her dead so much that they were willing to do so. But it's been almost 10 years, and they have found no one, working from that very narrow number to start with.
OTOH, if it's random, wrong-place wrong-time where a burglar happened to be burgling (or a deranged cosplayer happened to be doing his thing), and she interrupted them and got shot for doing so, there's no way to even begin to figure who that would be. The starting group is EVERYONE who could possibly have been there, not just the ones she knew previously. There's no place to even start. Ugh.
To me it's informative that in the hundreds of thousands of posts here over the years, the viewing of the crime and the video to decide whether she was targeted or not is ALWAYS being decided based on what someone wants to assume was in the killer's mind. What is the killer TRYING to do, in the video? What do they know? What are they thinking? What is happening when we don't see them? Do they know MB is going to arrive at some point? But unless we talk to the killer, we don't actually know any of that. The same actions can be seen as random burglar who is in no hurry (with no clue MB is coming) because the church won't be open for another 4-5 hours and then was interrupted, or a stalking killer knowing MB will come for class and walking the halls until MB arrives.
Of course, if it was a burglar trying to steal things, they weren't good at it. They apparently got nothing. And then killed someone (perhaps as they tried to get away).
OTOH we see no evidence they were looking outside, watching the doors and windows, etc. If this was a killer waiting for their prey, it was a very weird bad way to do it. It looks like the loser perp had no clue anyone was coming for hours.
So what was going on (burglary, or killing) depends on what the killer was attempting to do, when they broke through the door. And until we find who it was, we can't answer that question with any certainty. We can only guess. LE in the last PC they gave said they have no idea which it is, and it's not even 51/49 to either direction. (I think it's been so long with no success on who they knew, that it might now be leaning a bit towards random, but what do I know?) If they have no answer, we have even less. imo