Walmart chicken

MyLove and I were at Walmart picking up meds. As we were leaving she asked me about “that chicken”, one I didn’t see. We drove to the next turn in and, lo and behold, a chicken running around in the parking lot near some bushes. After spending too much time trying to wrangle it we confined it mostly to the bushes. Imagine a large old bald man on his knees crawling around in the bushes, surprised the police didn’t show up!

Caught, photographed and brought home. She is currently in quarantine, segregated from the rest of our flock. The bottoms of her feet are almost neon yellow. What is she?

Thanks for any help you can provide!