I would say those are worms, how long ago did you redose her? Thats probably why she is expelling them.
Also I want to add that I have a 3 month old silkie pullet with the large air or fluid filled squishy crop too. She is thin so I do not think that she is processing food correctly. No smell, as you say when you empty the crop, just does not seem to go away. I isolated her several weeks ago but she acted worse being away from her buddies after 2 days so I put her back. She is still alive and still has the balloon like crop, though some days it does not seem to be as bad.
I fully expect her to die eventually if she cannot process feed right but I think this may just be some kind of digestion problem in her that may not be fixable. They have never been exposed to the outside to get worms and she certainly is not impacted.
I know this does not help you, but the fact mine is still alive is a good thing I guess??