I have a hen that up until a week ago was laying but now has stopped. I noticed she tries to eat but can't. She did have a foamy mouth for a couple days but that seems to have cleared up for the most part. I give her water, yogurt & olive oil by syringe. She sometimes open her mouth as if trying to breath but then goes back to normal. I can only describe it as this....when we have sore throats and it hurts to swallow and our tongues hurt....that's her. She is her normal self otherwise, still running around & flying at me for treats but just can't eat them. I notices some lumpy swelling around her lobes. Any ideas what it could be and at home treatments?