You need to get import documents done. International Veterinary Hospital can help you with that:
During flight just keep the cat in the box and in the cabin with you and offer water from time to time, that is all there is to it. It will probably be quiet throughout the flight. Do not give her any kind of tranquilizers!!
Finally, when you arrive in Kuwait you will have to go through the painful import process, they will take the animal to the cargo terminal and you will waste 2-3 hours of your time before the paperwork is done and you are able to take your cat.
Thank the retards who were illegally importing lion cubs for that.