Hmmm, well it's not ideal, but it's being high for long periods that cause all the major damage. And it's pretty much impossible to get perfect numbers all the time. But if you are worried you could try doing your little one's injection earlier, say 15-20 mins before eating, to give the insulin time to get working before she eats, this might reduce the size of the spike. Finding the ideal delay will take some experimentation however!
I did her insulin 30 minutes before her breakfast, she was refusing it at first and only started to eat when she hit 3.5 and she still went up to 14 😱
Surely it's still going to affect her if a third of the day at least she's over 9 because she's spikes so much?