@Red_Letti,
A nightmare for you !
I hope the ambulance has arrived and your daughter has received the treatment she needs.
Hopefully she has or is fully recovering.
What you could not have known is that alcohol impedes glucagon's action to release glucose from the liver.
(type1.org - Why Doesn't Glucagon Work with Alcohol)
YOU DID THE VERY BEST YOU COULD IN THE CIRCUMSTANCES.
I imagine the ambulance would have given her a glucose infusion.
Once the adrenaline rush settles and you have been able to settle your breathing, and kept breathing steadily:
in the next days you, your daughter and your family have an opportunity. Counsellors and other professionals will
likely be involved to support and assist you all in working out what to do to prevent this happening with your daughter again.
And this is not about blame, self recriminations - it is about now and the future. Personally I have learnt to cloak anger in sadness. Sadness about how this happened and what could have prevented this. Anger and frustration burn us, sadness leads to hope for something better in the future.
Please make use of family, friends, supports, this site and so on to support you and your daughter.
Best Wishes for that future. Of course your daughter can use this site and others for help and support too, if she wishes.