Hi Deanna!
What's going on with her food? Is she still eating kibble? If not, when did you transition her to canned food?
Likely, what is happening is Baby is bouncing. Here is a definition of bouncing:
“Bouncing is simply a natural reaction to what the cat's system perceives as a BG value that is 'too low'. 'Too low' is relative. If a cat is used to BGs in the 200's, 300's, or higher for a long time, then even a BG that drops to 150 can trigger a 'bounce'. Bouncing can also be triggered if the blood glucose drops too low and/or too fast.The pancreas, then the liver, release glucogon, glycogen and counter-regulatory hormones. The end result is a dumping of 'sugar' into the bloodstream to save the cat from going hypoglycemic from a perceived low. The action is often referred to as 'liver panic or 'panicky liver'. *Usually*, a bounce will clear kitty's system within 3 days (6 cycles).”
Also, here is a link to an explanation of the two dosing methods most of us follow here on the forum:
Sticky - Dosing Methods: Start Low, Go Slow (SLGS) & Tight Regulation (TR). Following one of these methods helps us to know when and how much to increase/decrease in dosing. As Tim mentioned, if you were following SLGS, the more conservative of the two methods, a drop below 90, which she did today, would earn a .25 dose decrease. SLGS also gives some guidance about shooting lower than normal preshot numbers (like you had tonight) and when to make decisions about skipping and/or reducing doses. Bear in mind, over time, as you gather data and begin to understand how Baby is managing her insulin, you can relax some of those numbers mentioned in that section so that you can begin shooting in lower numbers. Of course, you can always come on the forum and post for guidance about what to do when you see lower numbers.