I think things will settle down but it will take time. The other thing I have found is that there are so many variables that affect blood sugars as I'm sure that you find with your daughter - exercise, growth hormones, eating out etc.
I have to be honest that 18 months in I still test once a night at 3am. Hopefully when things settle down (mine took about 3 months to get the nights right) you will find that you may only need to test once if at all. It's the changes in our own bodies which has a knock on affect on daily blood sugars that is so so frustrating as it's not something you can control or plan for. Al the best.