My daughter is 5. She’s been T1 for 3 years now and she’s been on Humalog and Lantus the whole time.
There isn’t a specific number that prompts me to give her carbs in the middle of the night. Once I know her Humalog has run out (4 - 4.5 hrs) then I take two readings and hour or two apart to see how fast she’s falling. That tells me if she’ll need juice or not throughout the night or when/if I need to check her again. Some nights she gets a few juice boxes. But we go on long hikes together most days, and the exercise makes her nighttime numbers inconsistent from night to night.
She gets her Humalog at the same time she wakes up. She doesn’t even feel it when she’s asleep. Then I wake her up and feed her. She spends most of the morning grazing on her breakfast. Morning shots are in the thigh, they absorb more slowly than other sites so she can eat slowly without going low. If she wakes up high she gets the shot and then I delay breakfast and check her BG often. When she comes down I give her part of her breakfast and wait for her BG to come down again. If I do the normal routine on high BG mornings then she feels crummy the whole day.
This is my advice to you … If you’re going to vary her diet don’t do it at bedtime. If you vary it during the day and she goes high/low it’s easier to fix than it would be at night. Also exercise effects BG, A LOT. My daughter needs extra Lantus at night if she’s exercised a lot during the day. Also watch her closely after extreme/unusual days of exercise. On rare occasions it makes my daughter’s BG drop and drop and drop before it suddenly levels off. It has to do with the liver dumping sugar during the day and then absorbing it again.
And don’t feel you have to put her on the pump if her numbers are good. Pumping is not going to prevent nighttime lows, and will not keep you from having to get up and check her at night. Actually they say you have to check more often on the pump. Personally I don’t want my daughter connected to a machine 24/7. And since my daughter’s last A1C was 7.2, I don’t have to put her on the pump.