My first problem

Letting the hens out to range today, we noticed one behaving differently.

*She is an 8 month old gold sex link and has been laying daily for 4 months.
*She is very lethargic and hunkering down, head and neck pulled in. Her comb is droopy. She is not moving around or "interested". No respiratory symptoms or visible parasites. Poop is normal.
*She has had these symptons several hours.
*At first I suspected she was egg bound and although I did not feel an egg (where I thought it would be???), I did give her a warm bath and massaged her lower abdomen. She tolerated this very well. I dried her off and put her in a dog crate with water and home made yogurt.
*Then I wondered if she was having crop problems. Her crop is hard but not overly large. I have been massaging that as well.
* I went to town and bought poly vi sol and gave here 3 drops. I also bought pedialyte and she has had a few sips.
* I don't want to lose her, but it my intention to treat her myself. There is no avian vet in the area.

Any ideas?