Is Schatzi suffering?

Schatzi's behavior today begs the question: Is she suffering from mental illness?

Usually, Schatzi behaves like a normal dog, but today she is doing strange things. Most notably, she is constantly (more than once per minute) stretching her neck back and up, as if she is looking at things flying above her. You can get a sense of what this is like watching this short video:

This behavior is unusual for Schatzi, but not unprecedented. From time to time, Schatzi keeps looking up and around. These spells usually last for a few days and coincide with other uncharacteristic features.

Also noteworthy is that Schatzi shows no interest in play or patting/attention. She spent more than half an hour sitting by herself in the bathroom. She has never done that before.

Here's a thought experiment for you: What if Schatzi is afflicted with some kind of episodic hallucinatory dog schizophrenia? If she were seeing flying objects swooping at her head every few seconds, maybe she'd be looking up at them to track their movement. Maybe she'd run from one resting place to another, usually a den with a low roof (like running under the chair, or the bed, or into her cage), trying to get away from whatever was buzzing her.