I have a 3 month old chick that has sour crop again. She just went outside full time a couple weeks ago. When I noticed her full, squishy crop, I kept her inside, gradually introduced food again, and she healed nicely. I put her back out and within a couple days, she was ridiculously full again and vomiting a couple days later. She's back inside, but I don't want to have to keep doing this. She seems to eat a lot and really fast. When she started bowel movements again the first time, she was pooping straight up grass. I offer grit, but I don't know if she takes it or not. What can I do so this doesn't keep happening? None of my other chickens have problems.