At this age, this is strongly suggestive of a upper respiratory infection.
You can't delay! This could easily progress into a bronchitis or bad pneumonia.
In addition, this is usually due to a underlying bacterial infection, and not a virus. Very important to get her into a vet, who will almost definitely recommend starting a oral antibiotic like doxycycline or clavamox. Also, depending on how the lungs sound, it is possible they may also suggest a chest x-ray.
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