I am new to keeping chickens. I have 4 pekin bantams that are only just over a year old. Yesterday they all came out in the morning as normal. I went to them in the afternoon, as I do everyday, to give them their corn and sunflower hearts and noticed my lavender was sat on the run floor. I picked her up and she didn’t seem to want to use her legs and just sat there letting me tip her on her side whilst I tried to examine her. She also had her beak open but I couldn’t hear any rattling or wheezing and her face and wattle were very pale and her pupils seemed very big and she started to close her eyes. I popped her in the coop in a nest box and started to try researching what it could be. I thought she could possibly be egg bound so I went down to get her to try bathing her vent and she had moved into the middle of the coop and had died with her head forward and tucked under. I am absolutely gutted because she was my favourite and was the most friendly. I couldn’t feel an egg inside her after she died and I examined her and her crop was empty. I am worried about my remaining 3 in case it’s some sort of illness she had. One of my others has slight feather loss around her neck and one has feather loss on her neck and is quite bald down her front but my poor lady that passed and the remaining chicken had no feather loss at all. Sorry for so much info I am just trying to get it all in here. Any help or advice would be very much appreciated. Thank you