I'll put my two cents in on the dog thing, because I have 20 years experience raising and training dogs...
Not all dogs like kennels. Some might like a cage but not a vari-kennel. Some might like the vari-kennel but not the cage. Some might not like either, and some may not give a crap. When I hear, ALL DOGS LOVE CRATES, I scratch my head. It's not so simple and it's just not true. Especially when you factor in how the cage/crate was used (positively or as a punishment).. but I have had dogs that just DID NOT LIKE THEM. I own/show/raise Cane Corsos, and I can tell you that 75% of the Corsos I've had will bust out of a crate. They simply do not like them. Now you could probably find someone who's had a lot of Corsos tell you the opposite, but really, it all depends on the dog.
I locked my one Corso ***** up in the bedroom when I left. It was the ONE room she wouldn't get into anything or destroy something... or even potty. I could leave her there for hours. If I put her in a crate, she found a way to bust out of it, and don't even ask me how many cages she's mangled!
Some dogs get bad separation anxiety when locked in a cage as their owner leaves, more so than if they have an entire room to themselves. It's quite possible whenever she left or went outside for a short period that she would leave the dog shut in her room. I really don't find that odd behavior at all, because I've done the same with mine.
As for where the dog was locked up, I could see someone in the moment, having just done something to KM, just rushing in and putting the dog somewhere and going. Even JC. Especially if it was barking, just put it in the closest room and shut the door. So right now, the location of the dog isn't bothering me in the slightest.
Also could it be the dog was sleeping on the bed with her the reason it was shut in her room? She gets up but the dog stays laying on the bed (mine rarely get up unless I am up for more than a few minutes) and she just shuts the door behind her?