Clouding of the eye is a symptom of conjuntivitis ("pink eye") in sheep. Pull
back her lower lid and see if it's redder and puffier than the good side. If
so a small tube of antibiotic cream will do the trick. We had a ewe like this
a few year's ago - it looked pretty much like you describe.
Trisha M-S
Marmont Jacobs, Montgomeryshire, Wales