Bring her in to separate her from the rest of the flock you don’t want it picked on by other ducks or especially if there’s chickens around. You can bring one of her best friends in with her so she’s not freaked out but you need to watch. Don’t use blue coat. Spray . But yes vetercyn spray is great. You can add some Neosporin ointment. Make sure you use the kind that does not have pain relief. You can use generic of course. She does not need a bandage, but you want to make sure the bleeding stops. You can use a little cornstarch to get it to clot if it’s still bleeding, but if it continues to bleed and does not stop, then you’re going to have to get a pair of clean pliers and a towel to wrap the duck in and hold her tightly hold the wing in place tightly , you grabbed the feather near the base and pull with a strong sudden jerk to get that feather out or she will bleed to death. If it keeps bleeding there are more detailed instructions on how to do this maneuver let me know please if she is still bleeding and I will Will send you the detailed instructions . I would also give her some electrolyte water.. and keep her inside overnight maybe a day or two until it looks good enough that the flock won’t pick on it