My 18 month bluebell hen has been I'll for the last 5weeks. Originally taken to the vets 5weeks ago as was lethargic, burning red comb and hot body. Was put on anti biotics to treat an unknown cause. She perked up but has slowly gone down hill since. Her comb is now pale, she's lost a lot of weight, is lethargic. She eats but not with the same enthusiasm she had before (was a right chunky madam before). Still enjoys treats. Fresh corn.scrambled egg but again not as enthusiastic as she was. She is 1of 5 hens, no problems with my other 4hens. All are wormed regularly. Iv had no egg from her since before she went to the vets 5weeks ago. Our vets are not chicken experts and I feel all I can do is have her put down if things continue. Any advice appreciated.