We are raising 2 Cayuga hens and 3 Rouens (2 hens, 1 drake). They are 7 weeks old. They all just passed their "droopy wing" stage, all but one Cayuga. Her wing tips still hang down, and many of her feathers look wet and unruly. Is she just a late bloomer, or is something wrong? They all seem active and healthy. We have raised Cayugas once before, but have not seen this in the past. Any ideas?