We have a Columbian blacktail hen that's been ill for nearly 3 months now. It started when she had impacted crop, after treating this with red wine, olive oil, acv and yogurt we managed to get rid of it. Since then she's had sour crop and we can't get rid of it. Every morning we make her go sick and then feed her live yogurt with a mashed up egg. It has improved a lot and she's active but it won't fully go and if we add any other food she goes back to square one! We've given her antibiotics from the vet but it hasn't made any difference. Anything else we can do?