Our ducks went for a swim in the bath tonight... and when we put them back in the brooder, our white runner is stumbling all over the place. She can't stand up or straighten her neck. We keep placing her under the heat lamp, but she rolls and falls over the other side.... she won't eat or drink.. although it's only been a few minutes... What could be the matter with her??? She is almost 6 weeks and they have swum many times and she was swimming just fine tonight. Please help!!