Meg
I'm so sorry for Tigger's health crisis.My Rosco has a very bad cough and had xrays done and they found he had allergy's against Broncitis,plus Asthma and much weezing.He's on Prednisone but my Vet the other day told me to use a dietary suppliment called Multizyme which helps his Asthma and coughing.Please ask your vet about it.It's capsules but can be broken up in the food or mix with water to shringe it into his mouth slowly so he doesn't gag.Not to much water is better so it's thicker.It may help her enough to slowly weed off the prednisone or there may be other natural remedies you can ask about.If your vet isn't into natural remedies ask one who does or I can call my vet and ask.Good luck with Tigger.I'll send prayer to her.Rosco still is on Prednisone but maybe your cat can be helped with these other remedies.