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Hello and thank you for using this site to help you. In many cases Kennel Cough is let go to run its course because it is similar to a common cold in humans. However there are times it turns into an infection of the lungs and will need antibiotics.
I would take her temperature rectally to see if there is a fever and how high it is. IF it is 100.5 to 102.5 then it is normal, anything nearing 103 or higher and she should definitely be seen by your vet.
You said she is vomiting and hacking up something?