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Hello, I am Dr Ola.. Any symptoms of lethargy with "head bobbing" makes me very concerned about the possibility that seizure activity may have occurred overnight. This can be caused by ingestion of toxins, liver dysfunction, or changes in the brain due to age or "idiopathic" (no known cause.) My best recommendation to you is to get her to an emergency animal hospital right away. She will some diagnostic testing completed to evaluate her overall organ function, place her on intravenous fluids for hydration and observe her the day. This does sound serious though, so I wouldn't delay in taking her in today.
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