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You should be ok to wait until tomorrow if you are comfortable with it. For tonight, you can try running a humidifier in the room and you can use pediatric nasal saline drops in each nostril if she is congested.
Kennel cough is often self limiting meaning that it can get better on its own like a common cold. If it has progressed to the point that the dog needs antibiotics, it has gotten more serious.
Let me know if you still have questions.