Thanks everyone! I know I am overreacting about this whole thing, but I have only owned her a little over a year [riding her for about 5 though], so I haven't really had to deal with her being sick before. I've never had to get the call "Your horse doesn't seem to be doing too well today," so it just scared me maybe a little more than it should. Hah
But anyway, she isn't much different today =/ I went last night as soon as I got out of my exam. I hung out in her stall with her for about a hour. While I was there, she was eating some hay and she drank some water, so I figured she was getting better. I went again this morning, and she had eaten her grain earlier which is good, but still doesn't look so great.
She is just so sluggish and sulky it seems. While I was there I tried to hand-feed her some hay, but she didn't take any of it. Eventually she slowly walked over and took one bite, but then she just goes back to the same corner and kinda stands there with her head down. It's just really out of character for her, so I'm still a little worried. I guess I just have to wait it out though