A. If this is a new thing please have it checked by a vet. It could be an infection/foreign body. Sometimes allergies or food can effect the eyes but if its only one, that's not likely the case here. There are other eye conditions like entropion that can cause the eye lash to roll in and irritate the eye. Best to have your vet examine her to be sure. She may just need some simple eye drops.
Your account has been reactivated.