I have just had two of mine with sudden scour, one of them quite ill - but only gave Buscopan, AB's to be on the safe side (advice from vet and I had a bottle of Noroclav recently opened anyway) and rehydration Treatment (lots of it - vet said to flush it out!). She wasn't interested in food (but nibbled hay) and no milk for a couple of days. Better after 24 hours, and actually she calmed down a lot (less cramping and she stopped trying to shed her gut lining) an hour or so after the Buscopan went in. My older goat just had the scour (and it stank to high heaven I have to add) and she was back to normal wihtin a few hours, not even ill as such, just sh&t everywhere.... I think it was a viral infection, similar to the human 24hour bug, some get it worse than others... One goatling a bit on the scouring side just now as well. I had it in previous years, and as the initial signs are simialr as for enterotoxaemia I am totally worried every time it happens.
Hope your girls recovers soon, and you may have to watch out for others, although other than TLC there may not be much else you can do.