Im glad u took her to the vet in time, im not a breeder so i dont know much at all, i wish i could help u more... i feel sorry for Bitsy and u for having to go through this, but im happy that she was looking better when u had to leave her, i know there are a few good breeders on this forum and im sure they will give u all the help they can give...
Please keep us updated on Bitsy and the babies, ur in my thoughts!
Good luck