Hi FinneFarm 
Sorry too hear your chicken is unwell!
It would definitely be best get her to a vet as soon as possible. It sounds like she is rapidly declining!
Can you say what age she is?
What you feed your flock including treats,
have they access to oyster shell,
has she ever been ill before?
If you have Vit B Complex get some into her.

Sorry too hear your chicken is unwell!
It would definitely be best get her to a vet as soon as possible. It sounds like she is rapidly declining!
Can you say what age she is?
What you feed your flock including treats,
have they access to oyster shell,
has she ever been ill before?
If you have Vit B Complex get some into her.