it's good to see her walking. Just be careful of running her on cement ,asphalt etc because bumblefoot can happen. Her legs don't look all that strong either. Are you giving her Liquid b Complex?
Is this the only duck you have? Best way to keep any mating from happening with chickens is to keep them separated. Also some females just for him. I've never had any problems out of my drakes wanting to mate with the hens but they have females to keep them busy.
Does your duckling get exercise...
Pigeoned toe is a sign of Niacin deficiency. Are you using the liquid b complex over a tasty treat just for this duckling? 1 ml daily. If your not using this I would sure get it and treat this duck.
Such a precious duck, I'm thinking you have a drake.
I hope that is okay with you.
Is this a...
Sure looks like either a hen got her or she stuck her bill under or into something. The puncher would make me think hen. If you have some Veterycin you can use it the main thing is to protect from infection. Also, something like triple antibiotic ointment would work too.