And the crop never empties? I wonder if the light is having an effect. It might be worth moving her to a heating pad setup or withholding food for a little while to see if it empties.
I believe you when you say that her crop doesn't feel right. My Orpington stuffed herself full to the point...
Gotta treat the yeast. It takes a while, but it's not difficult. Read the article azygous posted. It will help!!
And I second stopping the massaging. I just picked up a hen whose crop was full and accidentally caused her to aspirate. She died because of it (she was quite old and dealing with an...