I see two area's of interest, the one on the middle toe looks to be stage two Bumblefoot which will require treatment before it worsens, you can also see bumble foot developing on the very right toe (Our side) which is only flaking as of now, but if left untreated will worsen.
Minor cases like this are fairly easy to treat, I would first go about soaking her leg in some Epsom salt water for a few days to loosen up the scabbing, then for a week or two apply an antimicrobial cream to the wounds every day. I don't see any cores in the photo, so surgery and bandaging shouldn't be necessary it looks like fairly minor bumblefoot in the photo.
If you have other ducks make sure to check their feet too, and if they do appear to have swelling or any cores please post some more pictures.
A lot of people fail to mention why the Bumblefoot was caused in the first place, so people end up treating the duck, and it ends affecting other birds or infects the same duck once again.
Bumblefoot (Podermatisis) is most often caused by hard rough bedding, but can also be caused by a nutritionally incorrect diet, obesity, poor hygiene, wet substrate, a traumatic injury that is causing them to put more pressure on one side of the leg/foot, or any other underlying condition that is causing some of the problems mentioned above like a niacin deficiency. I suggest you make a few adjustments to your management practices so this doesn't happen again.