I don't know if it is a good idea to not feed her for 24 hours or not. I would try an intense vitamin B therapy. I had 2 chickens exactly like yours & I treated them with crushed vit. B for about a week & they are both fine now! I kept them isolated & propped up with towels and added vit. B to their food & water.
Good luck with Buffy & I hope she get better soon!
Good luck with Buffy & I hope she get better soon!