If it were one of my two, I'd give her honey. It's a natural antibiotic. Manuka honey is the richest in it's health properties.
If it is kennel cough, when my two got it, I treated it with honey and olbas oil (I put this on the radiators in each room so there was a constant smell of it), and it cleared quite quickly. (I kept them in during this time and tried to keep the house relatively warm - luckily it was winter, so the heating was on).
I hope she's feeling better soon