Some friends had a kitty with diabetes and one was a nurse. She was able to do the insulin shots right before meals to keep Colonel Kitty fairly happy. The shot is really very simple and he did not have a problem with it, especially when he knew he was getting the good food, right after.
It is a very small needle, and I even did it when I was cat sitting, so it really was easy. I can email more if you like but it was very simple.
DK
hang in there & also have your vet check her kidneys & urine . prayers up here for your kitty