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Hello, I am sorry to hear you are worried about Juli. I am a veterinarian and will do my best to help.
This does sound like she has an infection in the big tooth just below the eye called the 4th upper premolar. Antibiotics might help until you can see the vet. I am not really worried about a brain infection, however.
500 mg amoxicillin is what I would give to a 50 pound dog. It might give her diarrhea if she is smaller.