I am no expert. Maybe someone else will chime in. But to me she looks thin and weak.
How long has this been going on?
Gape Worm? (has she been wormed)
Could she have something stuck in her crop? Does her crop feel hard, soft or empty?
Will she eat or drink?
I have read some folk using mineral oil to help things pass in chickens
I have used this method with my dog and worked like a charm. (as a puppy he ate every thing in site and could not poop, mineral oil down his trout and walah)
Not sure if it will work. But just a suggestion. Good luck to you. She is very pretty.