We have answers!!!!
She has an upper respiratory infection while being anemic. She is just showing it differently. The vet is hopeful that her anemia will even out once she has kicked the infection.
And to add to the fun, she has spread it to my other six horses.
So I currently have seven sick horses, all showing the infection differently. My special needs mare is handling it very well, thankfully.
Because of the fever reducer they are on, they are still eating and drinking, which I am grateful for. So hopefully they will beat this virus quickly.
I am on extreme babysitting duty for the next week or so.