I agree with Britster and megansmomma, it's time for a trip to the vet (unless you've already gone?) I've never heard of a dog coughing without haven't some sort of respiratory infection, like canine influenza or kennel cough. Kennel cough is HIGHLY contagious, so it would be a good idea to keep Paris away from other dogs until the cough has been diagnosed. Treatment varies for respiratory infections in dogs....antibiotics help for some and don't really help in others. And some dogs get better all on their own (in the case of kennel cough)...some, but not all! Some develop into full blown pneumonia, so it's probably best for a vet to be directing treatment.
From everything I've read, it's fine for her to have honey....in very small quantities! Don't forget that honey is basically sugar, so you definitely don't want to overdo it or it could create other bigger problems. Whether it will help soothe her cough, I don't know, but it's worth a try!