My 1-year old Delaware was possibly attacked about 10 days ago. She was making quite a racket and when I looked outside, she was flapping her wings wildly and then fell to the ground like she was dying. We live in a residential area so the only daytime predators are cats and and maybe occasional hawk. There have also been some bold Blue Jays hanging around. I went out and held her and she seemed ok and about 30 minutes later, she was running around with our five other girls. Three days later, I noticed she wasn't acting normal. She isolated herself from the rest of the flock, usually hiding in the corner of the coop or under our bushes. She is still eating and drinking, but not a lot. She moves slowly and methodically. I have checked her for impacted/sour crop and egg binding. I haven't seen any abnormal stools. I do notice that her comb is flopped over and her neck is curved. Could this be from the attack or possible disease? I am new to raising chickens, so any advice would be appreciated.