Awww, I'm very sorry to hear you are having such problems with your puppy.
Sounds like she had a hypoglycemic episode. It's very important to keep their blood sugar up. Here in the US we have a product called Nutracal that's a vitamin and mineral suppliment. We always recommend people have it on hand with new pups. I know there is something in the UK that's similar, but unfortunatly I don't know the name of it. Hopefully one of our members from the UK will know.
You can also use honey until you find out what it's called.
Good luck to you and your pup and let us know how she's doing.
Sandy, Koke and Lelaska's Mom