Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
This could be a swelling after the attack but my top worry is that this indicates an abscess (focal bacterial infection) has developed. This is something that is going to require an immediate veterinary visit today. This is not something you can easily care for at home. IT is going to require drainage and an antibiotic (by mouth or injectable) to clear this. My hope is this is an abscess and usually once drained and the antibiotic is started she will start feeling a lot better (I suspect she is lethargic because she has a fever or elevated body temperature).
Often with dog attacks we cannot find anything. Even we, as veterinarians, have trouble finding the punctures from teeth and it requires shaving hair to find them. If there was even one tooth that punctured the skin, this would lead to infection and abscess formation.
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thanks, ***** ***** too late - I got to the vets before.
However fyi your diagnosis was correct