As the two posts above have given you good advice, does your daughter know when her BS is low as if she does this is a great help as she will be able to tell the teacher and then they can sort the hypo out. The more information you can give the school the better. I think in the last few years awareness of diabetes has improved to what it was but this is still your child and you want to know that the teacher are ready if anything happens. I agree that packed lunches will be best for carb counting but also remember she may be doing more exercise than she did before and you may have to make changes to her insulin or maybe a biscuit or two before she does PE but as long as she has glucose tablets or something similar. You may find the first few weeks a bit tough due to the change is routine but as long as you write all the BS down you should see a pattern of where she may need a slight adjustment to her insulin. There will be a lot of children who will notice the pump but i think diabetes has got that big that most children will know someone who has it. One last thing is in some schools they do not let the children to go to the toilet and i would ask that she be allowed to go as diabetics need the toilet more than others do but good luck and i hope she enjoys school.
