I am wondering...are you going to the vet for this conversation? If so, why? It looks like Gracie is doing great, so why does she have to go to the vet? I am asking partially because I think it might impact how I would 'start the convo'. If you were just supposed to go in for a glucose check since the doctor did not want you home testing, could you just call or email them?
I think I would let them know that I was doing regular home testing because I feel that not doing so would be irresponsible and would unnecessarily put my baby at risk. You could point out that the
AAHA Guidelines actually recommend it. (Using data from a 'legitimate' source can make them take you a little more seriously...and it should be much harder for them to dispute the facts.) Here are a few related excerpts from the guidelines:
"Home monitoring of BG is ideal and strongly encouraged to obtain the most accurate interpretation of glucose relative to clinical signs. Most owners are able to learn to do this with a little encouragement, and interpretation of glucose results is much easier for the clinician."
"In-clinic blood glucose curves (BGCs) are more likely to be affected by stress hyperglycemia than BGCs generated at home. Veterinarians should be cautious of high glucose results and subsequent overzealous increases in dose."
"The pressing concern for the newly diagnosed and treated cat is the development of hypoglycemia in individuals that may quickly go into remission. Cats on long-acting insulin may not show overt signs of hypoglycemia until the BG is dangerously low, so it is important to identify impending hypoglycemia by home glucose testing whenever possible."
You could share your spreadsheet with her to let her see the numbers - would she have wanted you to shoot insulin on those low numbers?! Maybe you could wait until there have been low numbers and no insulin for at least two weeks and offer to come in for a fructosamine to confirm/prove that she is in remission.