I agree the wound looks to be doing good, it just looks a little dry, try to keep moist as possible with the ointment to the best of your ability. I think letting her stay with the other ducks might be best. The only concern with her being outside, would, of course, be contamination of the wound either via bedding/feces or flies. The other ducks may try to pick at it as well, so maybe have her in a separate pen. Hopefully, the wound will be looking ever better by thanksgiving