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Hello. Thanks for the question.
If she is not responding, then I would probably get a second opinion with another vet. The reason, is because puppy strangles is an auto-immune condition. Antibiotics help the secondary infection, but the actual disease is treated with steroids (Prednisone). Without steroids, they don't tend to recover.
I would try to get a second opinion tonight or tomorrow and start steroids at that time. Most puppies improve fairly quickly after starting Pred.
I hope this helps, let me know if you have any other questions.