Thank you all for your help. We checked her for bugs and didn't find any, we have not seen her scratching or feeling uncomfortable. We decided to move her and her best chicken friend to a sick ward (we didn't want her to be lonely and she doesn't seem to have anything that we would have to worry about her passing to her friend).
I gave her some more scrambled egg with canned cat food and a few meal worms, luckily she still has an appetite, she at the whole thing! She drank a ton of water and ate some layer feed. Got her and the rest of the flock wormed. We will repeat in 10 days. I am hoping to see her perk up in a day or two so we know what we are doing is working.
So far the weight seems to be her only symptom, and she is really quiet, we used to never be able to pick her up and right now she doesn't mind at all. She hasn't been coughing, and luckily no runny nose or eyes. So I guess time will tell.
Should we be feeding her some greens also, or just continue with the higher protein foods? (Usually every to every other day we give them a bunch of spinach)