We also don't know where this bathroom was. Was it part of the master bedroom? If so, maybe she did put it in the bathroom, but the door didn't shut all the way and it got out. I feel like the person who said that she was probably in bed, received a text/call, closed the dog in to answer the door really fast (then she had her cell in her hand and the dog closed up) made a great point. I can't get that out of my head. Maybe the person on the other end said they needed her to come outside just for a minute which is why the dog was not allowed to go to the door. (If my dogs know the person and I was letting the person in the house, the dogs would be fine to tag along with me, but not if I was thinking I would step outside for a few minutes. Not saying all dogs are the same, just saying that that could be one scenario.) If I thought I would be gone long then the kennel, but just 3 minutes, maybe not. Maybe they just said, can you meet me outside in 2 minutes, I have this or that for you.
Someone mentioned the dog not barking when people wrestle. That freaks both of my dogs out, but it does take them awhile to really start barking. My little one usually just hides. It's the bigger one (the rescue) that gets really upset, tries to protect me. But if I'm having sex (sorry, but it's similar to wrestling) they both hide. lol. The little one goes under a piece of furniture and the big one goes in his kennel. My little dog barks at people coming to the door, but my big dog does not, even if it's a stranger. If I'm home he just wants them to love on him, if I'm gone then I've been told from a landlord (when the kennel door didn't close all the way and he was wandering the house and the landlord came in to do some repairs) that he growled and was in an attack position. It would be good to know if the dog was a barker.