I'm gobsmacked! I really hope this is over for you now and I'm so grateful you shared this. who'd have thought that filming your poor girl would give a clue like that. The scariest thing is out sounds like there may have been no sure way of them escaping a toxin like this, it really could have been all over your homestead.
Sending love your way and I hope the new arrivals will help you to heal from this.
There really is nothing we can do other than hope we can treat the animals fast. Activated charcoal at first sign of diarrhea. In fact I may give everyone a dose today just to be safe.