Thanks to everyone for telling her about the water!! OMG, I can't believe the things some people tell people to do!
Do these people who give advice that is not only dumb but DANGEROUS do it out of ignorance or are they PURPOSELY trying to cause a disaster??!!!
I am not blaming the OP, she only did what she'd been told....I DO blame those who give advice that is dangerous, whether out of ignorance or with evil intent.
IT doesn't really matter, the end result is the same.
Also, check her hooves for heat, and check her digital pulse....if her hooves feel hot or if her digital pulse is noticeable, call your vet.
Does she get grain?