So we took the Ruby (the chicken's name) to the vet, and they said it wasn't "sour crop". They didn't know what it was, but what ever it was, it was severe. The vet had to euthanize her. He is going to see what was killing her. I will report back when I get the finial results.
Btw I forgot to...
I got some new chickens, but that's about it. We set an appointment at a vet for tomorrow. How would I put her to sleep, and if she is asleep, wouldn't she drown in her own fluid?