This was my first hypothesis, especially after seeing that the ceiling had lights, but she took two videos that day, one from downstairs (the first video I posted) and the first, she took this video from upstairs, where you can see the reflected lights superimposed on the window. Now if you closely examine this video you can see that the light from the ceiling sort of looks like an object in the sky but here are the problems, one is that the light is diffused and soft not to mention too large, and next is these light are static and unlike the first video they do not move independently to the camera movement or lack of.Hmmm ... the first things a researcher is going to ask is if this was videoed from inside the cabin, and was she videoing through a window? If so, you may be looking at a reflection in the glass from lights in/on/around the cabin.
The second things they may ask is did she notice the lights while videoing, if she did why didn't she zoom in on at least one of the lights? If she didn't notice the lights, then we may again be looking at reflections in the glass.
Also, the lights do not appear to be interacting with the fog, like in the first video where it appears to be fading in and out of the fog.