Just be careful with that leg band, they are made from hard plastic so it won't come off easily, the diameter is so calculated that they do no slip off the foot by themselves, so you cannot remove it just by pulling it off. Some of my ducks have been wearing leg bands for six years and are doing fine with them.
Hope your duck can make it! One of my muscovies was also limping when he was about that age, but recovered by himself...how is the duck eating now, what about her overall condition? Does she preen, does she socialize with your other duck? Sometimes, stress can cause a loss of appetite. Your duck is still unfamiliar with her new home and and if you have tried to get close to her this can increase the stress level.
Hope your duck can make it! One of my muscovies was also limping when he was about that age, but recovered by himself...how is the duck eating now, what about her overall condition? Does she preen, does she socialize with your other duck? Sometimes, stress can cause a loss of appetite. Your duck is still unfamiliar with her new home and and if you have tried to get close to her this can increase the stress level.