So it's beginning to sound as if her blindness and weight loss are due to a combination of factors, starting with poor nutrition. Now that she can't see to find kitchen scraps, the problem is getting worse. As 
@Eggcessive said above, she may be able find food if it is always left in the same place, but I think she needs more help than that. I think you need to take her aside and feed her by herself at least two or three times a day until you get her weight back up, and also be sure she gets grit in her diet because she can no longer find it for herself. I think you need to listen to what everyone here has been telling you and provide her with a proper, well-balanced diet designed for chickens, not for mammals. Otherwise there is a good chance you could lose her to malnutrition.