I'm no expert. But it reminded me of something I heard. At 9, she sounds to be getting on a bit. And if there's kids screaming about the place, charging up and down she might be wanting peace and quiet. Other than that, if there has been dabbling in the house like wija boards or even tarot; it may have attracted things from the world beyond, and dogs have been shown to be far more perceptive at such things than most humans. However, if none of the above are true, she may be ill, or just waiting to go back to the big kennel in the sky.