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Thank you for your question. My name is***** I have been a small animal veterinarian for 14 years and I'd like to help with your question.
So cats can develop pretty red gums from round gingivitis, but this sounds more severe than that. Sometimes cats get something called plasmatic stomatitis. This is a pretty uncomfortable gum disease. They usually have very red gums that are often recessed (leading to food getting stuck). They typically have a bad smell to their breath and often have pain and or drooling. The pain leads to less eating and weight loss. This may be what is going on with your cat.
If you cat has stomatitis then she will need to see a veterinarian. They really need to be sedated and have their mouth evaluated and any damaged teeth removed. The teeth harbor bacteria in the gap between the tooth and gum and make the gum disease much worse. Often these cats loose most/all of their teeth. Antibiotics to reduce the bacteria load in the mouth and steroids to stop the inflammation are also very helpful. Your veterinarian would also be able to test for an rule out other possible causes of an inflamed mouth.... such as kidney disease or the felv virus.
I hope that helps, but if you have more questions please let me know.