If the BG numbers continue to be between 40-130, for 14 days straight, you havea diet controlled kitty.
You will want to continue to feed only low carb foods, to keep your kitty in remission.
Has it been 14 days now with those low numbers? Sounds like it might have been several weeks since you gave her any insulin.
In that case, you have reached OTJ status. Congratulations! :RAHCAT
The neuropathy can take time to resolve, it that is what it is. Neuropathy usually damages the nerves to the rear legs.
Low BG numbers, time and those B-12 (should be methylcobalamin not cyanocobalamin) should help to resolve the neuropathy. It can take several months. It did with my foster cat Wink. He walks fairly normally now. Still bow legged, mostly up on his tippy toes except when he is tired. Then he walks more down on his whole paw but never on his hocks anymore.
Up to 20% of the daily calorie intake can be pure protein according to vet Dr. Lisa Pierson. It's here somewhere in a post, but I can't find it today. You don't want to replace too much of the canned food because the chicken doesn't have the needed vitamins and minerals a cat needs.
Here's hoping she gains more weight and regains some of her energy. Sending healing vines to your kitty.