I have 5 runners 5/6 weeks old. The smallest one Lily started limping. I noticed one of the other ducks was chewing on her leg. So I separated her from the other ducks right away. Ive tried the Epsom salt wraps on her leg and make she she stays off it and swims in warm water. Its been 3 days now and when I first noticed this she was using the leg a bit but as of today she wont use it at all. Any other suggestions?