It might be time stop feeding grains and greens now that she is trying to eat. If she can take the grains she can take the chicken feed. Is there a place you can buy chicken feed? Even starter feed or grower feed meant for younger chickens could work since they are higher in protein than layer feed and easy to wet with water. She needs grit and oyster shells to prevent bone loss. When did she lay an egg the last time? Hiding in a dark corner could mean she has light sensitivity; that sounds like a vitamin deficiency. do any of your other birds exhibit similar behaviours like hiding and being lethargic, not scratching?
I would first see if she improves with the proper feed but you need to buy some.
If she is really blind and she is unable to feed herself after you tried chicken feed, I would question her quality of life. She can learn where the food and water dish is but you can't move these things around in that case. She needs to be scratching and foraging, looking for bugs to get protein, and pebbles to keep her digestion healthy, and eat a balances chicken feed designed for her body specifically, and mingle with other birds of her flock. If she can't see these that would be a tough life.
