Hi Donnamum.
Firstly, I'd agree completely with Eddie, your efforts on your daughter's behalf are remarkable and utterly fantastic.
I use insulin and try and run and cycle regularly so I appreciate how difficult it can be to balance the glucose lowering effects of exercise and insulin with the sweet / starchy foods often needed to raise them again. You've already experienced the frustrations of big old blood sugar swings. As Eddie describes, the variables often seem to outweight the constants, unfortunately.
In my experience ( I was diagnosed type 1 aged 18) there are huge benefits to be had in reducing insulin dosages. This makes blood sugar levels much more steady and predictable and hypos become more infrequent. This, as you already know, implies reducing carbohydrates in the diet which may be difficult to implement with a child. Self-denial is an aquired taste!
I don't know whether this helps, but please feel free to PM me if you'd like to talk about it in more detail.
All the best,
fergus