This is all very helpful! I'll go out tomorrow when it's daylight to look around her eyes, since it's out of both of them. Although, I don't think it's swollen, other wise I think I would have noticed... She had a bright, happy look today, so I don't think it's anything too serious. I'll check anyway though.
She gets fed a weight gain supplement (she holds her weight like a thoroughbred), and a pre/pro biotic for her stomach (to keep her gut healthy because she colicks somewhat regularly). SHEESH. After writing all of this, she sounds WAY unhealthy. I've have a vet working with me as far as the weight/ colic thing goes. ANYWAY, I'll check those supplements and her grain to see if it has much vitamin A. If not, I'll add that to it!
I'll also do better about keeping the area clean so it won't create more (I didn't think of it that way until it was mentioned!) And if none of this helps, I'll the start flushing the eye and call the vet over again.
Dang horses! There's always problems. Or is it just my horse?