Hey thanks for looking.
This hen is approx 5 years old. She has thicker legs than her flock mates of a similar age. She stands shorter, too. Now that I think about it, I've never seen her in the nest boxes. Don't know if she lays so I couldn't tell you egg color. We get pale brown eggs from her flock mates (and maybe from her too..?).
My guess is dark Cornish? But I just don't know. Wondering if anyone can confirm that guess or suggest something else. Thank you!