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Hello. Thanks for the question.
I would wonder if she has a tooth root that has an infection. A fever could lead to the lethargy and decreased appetite that you are seeing. I would have the vet who did the dental recheck her tomorrow. If she has a fever or there is an area of inflamed gums, they will likely give a round of antibiotics to get that under control.
Most dentals with extractions don't need antibiotics, but on occasion we'll see an infection and have to treat it specifically.
Metacam is pretty safe. It is metabolized by the liver and excreted by the kidneys. This is the same as all NSAIDs. It wouldn't hurt to check kidney values. I think it's unlikely to be kidney failure, though.
Oh yeah, she could have what you would call dry socket in people- an infection in the empty socket as it's trying to heal.
I think that will help. If the body fights off the infection on it's own then you could avoid antibiotics. If things are not improving day to day, then I would get an exam sooner either there or with a new vet.