I don't think it would harm her though I am not sure it would do much good either.
Kennel cough virus usually takes about 10 - 14 days to pass through the system and treatment is just supportive so that the dog does not get secondary problems such as pneumonia with it.
You might find if she is really congested that bringing her in the bathroom and running the shower with the bathroom door shut will help break that up as the steam is good for that.
Hope this helps you!
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