There's currently no cure, but medical developments are happening all the time and it's quite possible that there will be a cure for your daughter in 5,10 or 20 years. In the meantime, you need to try to keep her blood sugars as normal as possible so that she keeps healthy. I know it's heartbreaking to have to inject such a small child but if you keep at it it will get easier as she gets older and you get more experienced.
I'm afraid I don't know about milk advice.
Can I ask where you're located, as health systems vary according to which country you're in. (No point giving advice about the UK NHS if you're not in the UK).