My sweet little silkie hen has an obsession with eating rocks She's waddling around with a giant, distended crop full of rocks and looks uncomfortable, but not ill. She feels thin, I see her eating but her crop is so full of rocks I doubt she can get much nutrition in. Crop isn't impacted, still elastic - I tried to give her a tablespoon of vegetable oil but she choked on it (did NOT want to swallow) and then I massaged her crop for about 5 minutes, it feels so heavy and gritty and full - will this pass on its own? I won't allow her to free-range for a few days as she is only adding to the problem... Any advice? Opinions? Thanks so much!!