Wonderful picture Kathy, two adorable babies! And incredible news about Willow's BG readings. Just so you know, Willow is still a diabetic although a diet controlled diabetic. Idjit was one of the lucky ones also, and boy were we surprised! Be vigilant and keep checking her BG to be sure she doesn't creep up again.
Here is a little info on remission from the Lantus forum Start Low Go Slow protocol:
Remission is reached when kitty can go 14 days without insulin. Most cats will remain in the range of a healthy cat 50 - 80mg/dL (2.7 - 4.4 mmol/L) with only sporadic higher or lower BG numbers.
Occasionally, some will experience infrequent BG numbers higher than the norm. Continue feeding low carb food. Test the cat's BGs once per month. If BG numbers begin to trend upwards, it's time to bring kitty in to see your vet for a check-up. Common reasons for kitty falling out of remission include dental issues, infection, inflammation, pancreatitis, etc. Just about any illness or disease can do it.
I think it's wise to test more often than once a month at first, just to be on the safe side. If her numbers are creeping up, you will want to be aware of that, and take action. She may only need a very small dose of insulin to help her pancreas completely heal and function like it should, and then be able to be OTJ (off the juice) again.
Be sure to create that signature with Willow's information, and create the spreadsheet so that if you need to make some adjustments and need help, that information is available.