D.M.
Is it a croupy (barking souding cough) - could be croup. The cough with this sounds nasty, but the concerning part is stridor (trouble breathing b/c of contricted airways). If you think this is the case, get her to the Dr right away.
You can try to keep her well hydrated. Also, put a humidfier in her room at night. Maybe put her in a steamy room when you shower (with some toys to play with to "steam her". Saline is great to flush the system too.