Have you tried animal control to see if someone has reported her missing?
Glad you found her and were able to catch her. We've had a few Polish, and all have been special needs in some way. From the failure to thrive chicks, the cockerel who thought the sky was falling and ran around screaming all the time, the pullet with a horrible case of scoliosis of the neck, and yes, a hen who aimlessly wandered a few times. First time she almost walked into a busy road. Second time she was returned by animal control from the next town after she was found a quarter mile away laying an egg under a bush. Third time she wandered off into deep snow, and was never seen again. We no longer have Polish.