Just pulled this off google for you :-
Cat Treats
Treats and foods appropriate for diabetic cats are still areas of debate among nutritional researchers and vets. You must consider dietary restrictions of any concurrent medical conditions. The general dietary recommendation for diabetic cats is high in soluble fiber, low in fat, and higher in protein. But if your cat's kidneys are not in good shape, less protein is better.
Treats are always a problem for diabetics. Whatever you give has to be considered part of their daily allotment, since even tiny amounts of food can have a significant effect on BG. In all foods, it is the carbohydrates and simple sugars that are converted to glucose. Simple sugars hit the bloodstream fast, the complex carbohydrates take longer because they have to be converted first. Discuss with your vet what treats and foods are appropriate for your cat.
Try to find treats that do not contain simple carbohydrates like corn syrup, malt flavoring, or other sugars (glucose, dextrose, maltose--the "ose" means sugar. Look for products where some type of meat is listed as the main ingredient (if your cat doesn't have kidney problems).
Some treat suggestions:
Vaseline - no nutritional value, but helps to prevent hairballs and ease constipation. Too much interferes with vitamin absorption.
Low protein - Green beans (fresh, frozen, or cooked with meat flavoring), olives (high in fat)
High protein - baked chicken or other meat, tuna (juice from water-packed), cheese (often high fat)
Dry commercial treats that are higher in protein and don't have corn or sugar, like the Nature's Recipe Optimum Chicken Meal & Rice or Lamb & Rice Feline Crunchy Treats are pretty good. Kitty Kissers has a 100% chicken liver, all natural treat.
I dont know how good it is for you but might give you a bit of info

How is she today??