Just as an afterthought also - and I don't write this to panic you, but please as a precaution check & change all her possible water supplies on the ranch and make sure your livestock (if you have any) have a change of water too in case there is anything nasty in there - if they have self-filling troughs, ask around your neighbours and make sure there hasn't been any water pipe works around recently which may have effected the water coming into your property. Check your dogs for bite marks in case the vet missed anything (if you have snakes/ spiders in your area) and have a look around your ranch to ensure no dodgy looking dodgy has been left out for her. Have any of your other animals been affected?
I really hope not. back to the vets, or call one out to your home if yu can to get her re-checked xx