I think you may be right. I have done a lot of photo comparisons and she does appear to be a Barred Rock. I can tell a noticable differance between The Cuckoo and the BR.
I have 1 Dominique about 4 months old and she is very docile and gets along with all the other hens. She loves to be picked up and petted and will even sit in your lap.
She laid her first little egg yesterday.