I too had a scare when my Silkies got into the duck pond in cold weather. I took the hen into the house and dried her off with a towel and then held her wrapped in a dry towel for a few hours. I did keep her in a warm outbuilding for the night before returning her to the flock though. This happened with all four of the hens, one by one. One hen died because she was stuck in the cold water too long. After that, I never had the hens go into the water again, they would just drink from the edge and they taught the younger chicks to avoid the water too. The roosters never did try to go into the water.