Now that you mention it, I think it is probably just poor/not up to standards colouring, but I think she is pure bred too. I got her from a local. (she was my first hen, I got her when I didn't know much about breeds or standards (actually I still don't know much about breeds or standards)).
Oh well, she is still my fave chicken out of my flock of 10. Not only is she alpha hen, but she is by far the most intelligent, she seems to know exactly what I want her to do or where I want her to go. She comes a running as soon as she see's me with a mattock or spade as she seems to know I will be digging and there will be worms up for grabs, but she doesn't jump on the tools or get in the way, she seems to know she has to stand a few inches to the side, and then after I've dug up, she digs in for the grubs. She is also quite docile, but not so much that she seems stupid. She does a very good job of making a racket to call for me when perceived danger is around . And even though she is alpha hen she is not a bully, although she does have to give a few pecks here and there to put some hens back in place (unlike my second in command who is the biggest bully hen if ever there was one). She is also very hard working, remaining busy all day constantly foraging and working the land. She is also my most efficient egg layer, giving me at least 5 large eggs per week. And she's brave, not scared of going into new, unchartered territory after taking a quick look around to make sure it seems safe enough. She's almost like the perfect chicken.