I agree with Jenmcswane.
Once you and your daughter have gotten more experienced with type 1, you’ll find that insulin dosages are just rough estimates at best. Everything that happens in a day could change your body’s insulin needs, the carb ratio, correction ratio, or basal amount.
I think basal is the metric that always needed the most fiddling with for me. When I was on Lantus before I got my pump, I would usually take between 12 - 16 units depending on how active I thought I would be the next day. On weekends, for example, I needed less basal due to less stress and activity. Now that I have a pump and CGM, I’ve discovered that in a “normal” day, my basal needs at night are three times my basal rate during the middle of the day, so in a 24 hour window my basal rate changes by 300%.
Most people get higher blood sugars and therefor theoretically need higher basal rates when sick. But not everybody is the same, it sounds like your daughter needs less basal, but if you aren’t yet comfortable adjusting rates, then you should ask the doctor.