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This is Dr. KV. I am here to help with Star. I am happy to hear you are taking her to the vet tomorrow, but very sorry to hear that she is not doing well. There are several things that could be going on...an infected tooth, general dental disease, or possibly a mass or tumor in her mouth or throat. Sometimes, older cats will have metabolic diseases that can cause nausea, drooling, and decreased appetite.
Please feel free to reach out if I can assist you further. Good luck tomorrow with the oral exam.
I'm so sorry to hear that! My thoughts are with you at this sad time. Rest in peace Star.