Overmating or mites?

[pigeonpuddle]

One of my ducks neck looks really bad, what can I do for her?
I don't have any male and only have 2 other females. They mate every time I refill their pool, which is basically everyday. I can't stop refilling their pools everyday since its dangerous hot here in texas, what else could I do? Could it be feather lice or mites? None of my other ducks have this

 

[Gigachad poultry]

She is likely being seriously bullied, and I don't thing it mating but the females say "hey thus us our pool get out"! And they are attacking her as a way of bullying her. I'd suggest you get done disinfectant spray and maybe some methane blue. However I might have said that wrong. Methane blue is normally used for fish with fin rot, but I think her is a poultry version. It stops bacteria from growing leading to possible infections not happening. You should also separate her and give her a small tub with water so she still has a place to cool off. Hope this helps and I'm correct.