Ooops, nevermind.. I did the logical thing and looked at her spreadsheet for the data!
OK, I don't think this was a fur-shot necessarily.
What might have happened....
You gave 1u on a AMPS number of 199.
What could have happened is that her BG dropped low about 5-6 hours later. Low enough to cause her system to "panic". A diabetic cat is not used to low BG numbers. So when they happen, it can trigger an instinctive reaction that we call a "bounce". Her pancreas and liver will release "sugar" into her bloodstream, because they think the BG is too low for comfort. That results in a much higher BG number right after it happens. IF this is what happened, then the 384 is just a bounce.
What this could be telling you is that 1 unit on a number around 200 is actually too much insulin.
If you look at the AM cycle on 3/7. You see how she dropped from 433 all the way down to 188 on a 1 unit dose? Well, today, if she dropped that much, her number would be negative, and she'd have had a hypoglycemic crisis that can actually be fatal. Not trying to scare you, but trying to illustrate what could have happened. I'm thinking that her BG got to a critically low number, and her body reacted in "self-preservation mode".
What this means is that if you want to give insulin on a 200 or so preshot, then you will need to give a much smaller dose. Like .25 units, or maybe .5 units. I know it's hard to even see that in the syringe, but do you think that would be possible to do? If not, we can look at maybe having you switch to a different type of syringe, and using a conversion chart to figure out how to draw up tiny doses under 1 unit more accurately.
Carl