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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.
Most kennel cough resolves completely and doesn't come back once they are better. It makes me wonder if she has a really poor immune system or if something else is going on here. I do think she is probably going to need another round of antibiotics so you are probably going to have to take her in, but as to whether you should go right away... it depends on how she is feeling. How is her appetite? If she is not eating and lethargic or has a fever I would take her right away. If she is coughing a lot.... such as when they can't get comfortable and rest because they are coughing so much or if her breathing is fast or labored at all I would take her in right away.
If she seems relatively comfortable then I would keep an eye on her for any changes and make a appoint for when the vet can see her.
I hope that helps, but if you have more questions let me know. If not, please rate my answer.