Lame chicken with head retracted and puffed feathers

[Chr2241130]

I have an OEGB that has been less active/ alert the past 2 days. Today she is staying in one spot for the most part, her head is pulled in and she keeps closing her eyes. She doesn't show any trouble breathing (yet). She hasn't been eating much either. I am unsure what I should do. :/

 

[Dec17]

Sugar water! Separate her and put some sugar in her water if that works keep her on if for a day or two and then maybe some vitamins and try some treats with her greens or make something up for her