Sour Crop Maybe, what do you think?

[redsix]

The hen is not eating and is flicking her beak. I turned her upside down and messaged her breast and got some liquid out. The reason I think it may not be sour crop is because her crop is "empty". I isolated her and gave her water with an electrolyte and sour cream with an antibiotic. I'm thinking of trying to give her some fish oil with a syringe or try the Monostat treatment, but I might be treating the symptoms incorrectly.