I don't have this problem but I have a few suggests for getting the sun out of her eyes. A hat, sunglasses,a pillow to put her face on when the sun comes in, a tent around her w/ a blanket have an opening where she can see you and the shades. We go on trip every two or three months with my children and it helps to have these things handy. They are always in my car!
Take her to the doctor just to check that everything is okay and go see an eye doctor.
Hope this helps,
L.
ps my daughter cries like she is dying if the sun is on any part of her body. lol nothing is wrong w/her when I put her in her blanket tent!