Just went outside and noticed one of our female mallards had white eyes. So I picked her up and her eyes look bubbly,foamy white and look a little irritated. They do not really look swollen, but not quite right. She also has a pretty large swelling on the top of her head. She is acting normal other than shaking her head a lot. She seemed fine this morning when I was out with them and a few hours later this. So does anyone have any idea what is going on with her or what I should do? I isolated her from the rest. Thanks in advance.