S.H.
Hi
I would suggest taking her to an optometrist rather than the doctor. One of our friends is an optometrist. He suggested we shouldn't take eye problems to an MD but rather an eye doctor - after all that is what they are trained in.
The water / chemical levels are likely fine. She could have easily picked up a virus from pool water too, maybe pink eye.
In any case it will likely be easily fixed up with some professional input.
I use a natural remedy called Occuheal that I get from my naturopath.
Hope it gets better soon.