Hi
Sorry to hear about your girl, it's always difficult, there's always 'IF', and could it have saved them, been there, still feel bad about mistakes I've made. But it sounds like your girl went down very quickly, is the vet suggesting it's worms then? Or did she suggest anything else it could be?
I lost a goat with septicaemia, she went down and despite vet she died the following night. Could your girl have cut herself a little while ago? Doesn't account for the discharge though.
Good luck with finding some company for the boy.