yes that's normal that she seems to like higher numbers better than lower numbers. We've seen that a lot, I saw it with Punkin too. I think of it like this: you drink a cup of coffee every morning and caffeinated is the state that your body likes, and if you take away the coffee you feel tired and draggy even though that is your normal state of being. Once you get used to the no caffeine, the natural state, your body will love it as well. Same thing with the blood sugar. its like the kitties are tired when they first get into lower numbers, but once they get used to them then they perk up and end up the zooming around the house.
Also, insulin is a hormone. Absorption rates can vary by as much as 50% from one day to the next, even if you do everything else exactly the same. So you can feed the same food, shoot the same way, give the same dose, and the absorption rate still can cause as little as 50% to get into the body. So variations on cycles are normal And sometimes beyond your control.