Crazy-
Keep us updated on your girl. I'm so glad I ran across this thread... My BLRW, Potpie, has this problem but DH and I just joked that she had a "beer belly". I had no idea it could be a health problem. Like your girl, she eats, drinks, lays, and is otherwise totally normal. She's just one of those hens that pigs out on everything.
I read the post that Seachick started back in December and she did great re-caps of what she did and how the bird was. I'll be following what she did, and since the vet is not an option for you, you may want to try it, too. Here it is to make it easier to find (for both you and I!!):
For anyone searching for info on crop problems in the future (as I spent hours doing) here is a recap:
Initial Symptoms: very full crop that did not empty at night, not rock-hard but pliable like modeling clay, could feel fibrous material. Thin bird. "Dandruff" of flakes off the feather quills>
First treatment: Isolated bird to dog crate inside, on newspaper so she wouldn't eat any more fibrous stuff and I could monitor poop. Massaged the crop for 5-10 minutes periods ever few hours. Fed water with raw apple cider vinegar (a small splash in the waterer) and plain live-culture yogurt mixed with baby-bird-food from the pet store.
The next day her crop had partially emptied but still had some finrous, clay-like solids. Fed more of above foods, plus bread loaked with A LOT of olive oil, and later with mineral oil. More massage.
New symptoms: Perhaps due to the strange diet, her crop blew up again but different: soft, squishy, gassy and balloon-like.
Treatment: Continued with massage. Stopped the yogurt and ACV in case they were responible for the gassiness of the crop. On vet's recommendation, fed her normal food (layer pellets) soaked/softened in water. Also fed some chopped ppached egg. Continued with massage.
That seemed to do the trick.
In retrospect, I think the massage and oil probably helped move the blockage, which had been making her unable to absorb nutrients, hence the skinnyness and dandruff. She seems on the mend now.