Can you post some photos of her and the beak?
It sounds like she may have cross beak. This can make it hard to eat. She may need a deeper dish so she can scoop her food.
You may have to try to clean the eye again, flush it with saline and if it looks irritated, put some vetericyn eye gel or terramycin ointment in it.
I'm sorry, she doesn't look like she feels well at all.
Could be having a hard time eating. In the past did she seem like she was able to eat/swallow her food and water ok, or has she always had a bit of trouble.
Most of the electrolytes for chicks have vitamins as well, if yours doesn't try adding vitamins as well. You may also want to see if she will eat watered down chick starter, most chicks like it.
You could try separating her. If she doesn't seem too stressed by it. I know you are doing your best. If she is way behind, she could be a developmental (genetic) "defect" that just may unfortunately overtake her.
It's possible it could be coccidiosis. Is your chick starter medicated or not? You may want to treat her for cocci, that way you can rule it out as a possible cause of her decline.
If she is responding with vitamins/electrolytes, it's most likely not cocci. So I'm thinking vitamin/mineral deficiency. She may not be processing the nutrients like the others are. If she continues to improve, then you are hopefully on the road to recovery. I have provided a couple of links about vitamins. The one by Tillysnest also lists what foods have certain vitamins as well.
Cocci can be found in the soil and/or feces. Most medicated chick starters have a small amount of amprolium which is a Thiamine blocker. If she has not been outside, she may not have come into contact with cocci yet, though some chicks can still get it while still in the brooder. Once you let them outside, if any symptoms of cocci present itself it can be treated (most of the time quickly and easily) with Corid which you can get at the local feed store - just dose the whole flock - it's mixed into their water.