Thankyou all, only now have I come back to check. I’ve looked up mareks disease just now, but no, it definitely wasn’t that , as none of the other birds have this. We had to have April put down about a month ago

, we kept her going until we could see she was no longer happy. She laid quite a few eggs, even with the tumour on the leg, which stopped bleeding and hadn’t bled in a while and the tumour Of the eye. She stayed cuddly and happy playing with her sisters right until the day before. Then she just became really depressed and we knew she wasn’t happy, about an hour later, she had lost balance and kept falling over as well as having lost her appetite.
We had her put down at the vets, which was a pretty traumatic experience as the vets were ages and said it was because they couldn’t find a vein? I’m not sure whether her condition had made them very small, or whether it was just a very bad vet....
thanks all for your ongoing support