It certainly sounds like vestibular disease. It can be very disorienting. It can even cause stroke-like symptoms like staggering, one sided weakness, facial paralysis, drooling, etc.
This looks a LOT like a stroke but it's a quiet.
I would definitely give the vet a call and see if he wants to put her on a broad spectrum antibiotic like orbax and go from there.
Let me know if you still have questions.