Thanks, thats what I was thinking but I started wondering because one of my other chickens the same age has full gold neck and looks just like the Australorp x Orpington hen. I started thinking she may not be her mum. Now thanks to your help i now know. Thank you!
I have 5 hens one Plymouth Rock, two ISAs, one black Australorp cross Orpington I think and one maybe an Australorp. Her dad is black sex link Plymouth rock