i have always gone off what they have said as never had dealings with diabetes till she got diagnosed. x
Few of us did before being diagnosed ourselves. It's very daunting and scary to start with and must be even more so when you are looking after a child with diabetes. Any problems we make ourselves only affect ourselves, whereas any mistakes you make affect your child and that's hard to contemplate and live with. So it's perfectly understandable that you have been reticent and have done exactly what you've been told. I can also see the difficulties of having to deal with more than one child at a time, when one has diabetes and the other doesn't. Not to mention you are young and have to shoulder all this responsibility, but I do suggest that if you can, you do some research for yourself and find out as much as possible about the disease rather than rely entirely on your team. Some teams are excellent, some not so much so and some frankly poor from what I see on the forums.
If you can afford it I really do recommend you get that book. It explains things in words of one syllable and I think it would enable many "lightbulb" moments for you. You will be able to recognise all sorts of incidents, behaviours and problems and be empowered to act on them yourself rather than having to wait to see the nurse.
Obviously at the moment you are mostly dealing with Keira's diabetes, but there will come a time when she will gradually take over and start to deal with it herself. That's when your knowledge will become invaluable because you can pass it on to her. We see so many teenagers and young adults who've been given responsibility for themselves with no clue whatsoever as to how to deal with it. There is a tendency to fall between the cracks when handed over from the paediatric services to the adult clinic and that's where you will come into your own if you've gained the knowledge.