I would keep all the chickens in the coop until the cold passes - I take it that it is colder than normal. If you can warm up the coop alittle it might help. You dont want it too warm but just enough to thaw the feet. She should stay in the coop until the snow is gone if you can - mine stayed in on her own. Let nature take its course - it isn't pretty! You will know if you need to put her down but give her a chance. Her toes most likely will turn black and fall off but don't get too excited over it. If she can't stand, put her down.
Last year I had one who froze her feet, she is doing well this year. She had a strange accident on our first below 0 day. She spent the winter in the coop and in the spring part of her toes fell off. All has been well since. She raised our first chicks this past fall and did a very good job of it in the cold.
Last year I had one who froze her feet, she is doing well this year. She had a strange accident on our first below 0 day. She spent the winter in the coop and in the spring part of her toes fell off. All has been well since. She raised our first chicks this past fall and did a very good job of it in the cold.