Hi Vronnie
Loads of respect for children coping with type 1 - i got it at 26 and found it hard, but i'm always amazed on the whole how well kids just seem to adapt to needles, insulin and so on - is this what your daughter's doing?
Adapting to eating healthily is probably harder - although I just eat a normal balanced diet and certainly haven't cut sweet things out. If you feel that her diet wasn't normal and balanced to start with, then yes changes are probably helpful. And as people before me have said, strategic timing of sweet things (eg after a meal) is helpful, too.
Has she got siblings? Maybe they / you could adapt to a balanced diet too if you don't already. Making it a group effort could help her to feel less singled out.
My previous diabetic team had a dietician - is there a dietician you could talk to? Your gp could refer you or you may get automatically booked to see one.Definitely worth asking as they should have a wealth of ideas about this.