Is there a Ghost? or has this dog gone mad?

This is the 3rd night in a row, this Jack Russell dog has been staring into that corner and she's been barking at that corner,

A full length mirror was taken away from the wall next to her, a thought that maybe it was the mirror, but it wasn't,

In a previous video she was doing it in a completely silent house, there is some noise now but it's not the noise that's making her bark.

The previous night she woke her owner up by jumping off the bed. growling and running over to the corner to bark again. Is this supernatural or has she just gone mad? she makes several trips to the corner over a course of a day.