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It sounds like she has a motility disorder, meaning that the muscles in her crop are not contracting normally, causing food to remain in the crop. I can't find any references on pharmaceutical treatment, but frequent emptying of the crop appears to be important, as otherwise the crop becomes dilated and has even more trouble emptying. You might be able to manage that by frequent gentle massage to move the liquids along.
Here is a quote from this article http://www.birdsnways.com/wisdom/ww42eiv.htm
"Crop stasis occurs when the normal mobility of the crop is impaired, causing food to remain in the crop. The crop may appear enlarged orit may be hidden by feathers. Food, fluid and mucus or foreign bodies may be present in the crop. Crop stasis is most common in baby psittaciines (parrots) and may be the result of improper concentration of formula, infection or dehydration. In older birds crop stasis may result from lead or zinc intoxication, foreign bodies, candida, parasites or viral infections, including PDD. Whatever the cause, food that remains in the crop for prolonged periods of time spoils as a result of bacterial and fungal overgrowth and can lead to systemic illness."
I found that happened with far advanced pendulous crop. My blue Orp line was prone to it. Dusty never had it, but her sister, Smoky, did, and her daughter, Athena, owned by Ladyhawk, had the same condition. It progressively became worse with age, with both mother and daughter. LH consulted her vet about Athena's crop. He said he could do a surgical crop tuck, but that it would not be a permanent solution, that it was a genetic condition with her and would get worse again with time. So, we both did the massages until at 4 1/2, Smoky's crop completely quit working. We surgically removed the stuff in it, but the crop was basically dead.
My Buff Brahma, Caroline, had mild pendulous crop starting when she was a few years old and progressing as she aged. We always had to keep up with her food issues, but it was not what killed her in the end, that was just old age (she was almost 10, if you recall, and a hatchery gal at that).
I'm not sure the cause of Betsy's issue. All her sisters are molting and BRs are molting and none have any crop issues, even the oldsters. She must have gotten hold of something bad somewhere. But, as Lisa said, it could be something else wrong internally that is causing her crop to malfunction. Seems to me that mostly, crop issues don't begin in the crop but somewhere else. The crop is the visible part we can see, an organ that won't function if something is terribly off inside the bird. Dusty's short bout with sour crop, the only one she ever had, was shortly before her death at 9 1/2 years old.