Melissa, have you considered trying to feed them garlic? Garlic is a natural antibiotic and does not build up super germs. It is also antifungal and antibacterial. I would feed them some form of garlic and apple cider vinegar for a while. Hope the vet calls you soon. I pray for you when I think of it. I am continuing to pray that your sister can come to saving faith and knowledge of the truth as you have. God Bless you!