I have a one year old Rhode Island Red with a reoccurring sour crop problem. I feel like she keeps getting it because her crop seems to hang low. I have treated it twice now. Putting her in the crate hospital for my hens. I stop for for over 12 hours. Then only feed her eggs with nystatin as well as Keifer milk. It takes about a week to clear up. She always acts normal. Still poops and drinks and acts like abnormal chicken. Until the sour crop gets bad. When it does, she acts very hungry, will vomit when it seems full and wiggles her neck funny like she’s trying to keep her food down. I do massage her crop as well just to help with her digestion. Any suggestions on how to help her with this issue permanently?